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So this exact thing happened to me on my 23hp command. The biggest give away was the non stop clattering of the intake lifters and compression on each cylinder was 100 and 120. So I pulled the cam and nothing appeared bad, but what I ended up doing since this mower was cheap and don’t want to buy a cam and don’t have a spare. I broke the counter weight and rod mechanism for the compression release and welded the compression release so the mechanism would not longer move into the compression release position and bam 180 compression on both cylinders and after 15 minutes of running lifters bled and runs like a top. Once again Taryl, coming from a small engine repair expert, thanks for sharing this, becuase this is definitely a out of the ordinary small engine issue
This was one of your most enjoyable videos. As a retired instrument mechanic and electrical foremen, this was a prime example of my philosophy, no matter how aggravating "the tough ones are the ones you learn from".
Excellent, in-depth walk-thru of the issue with the engine. That seems like a few hours (at least) spent trouble shooting. But you fixed it...because Taryl Fixes All!!!! Great job. Now, time to celebrate your success and purchase some Taryl apparel. Thanks again!
Hi Taryl I just subbed to your channel Utube just recommended you out of the blue. I have been watching several of your videos and love your zanny comedy and your extensive knowledge and know you are the real deal, there is so much garbage on utube but your channel is totally genuine. I used to own a small engine repair shop in northwestern Saskatchewan, Canada in the 1980s I was a large Stihl dealer also a Suzuki marine, BCS and Homelite Jacobson, and Kawasaki small engines. In the later years I worked for a full line Honda dealership repairing motorcycles, Honda automobiles marine and small engines. I then went to work for a provincial run tech school as a instructor in the OPET program, Outdoor Powered Equipment and then to a medium sized rental company repairing everthing the from large gen sets to Genie and Skyjacks and power trowels , jumping jacks to chainsaws and cutquicks. I then retired in my mid sixties and sold off my tools. Cheers from north west Canada.
LOL, another great video. Got to love those engineers and number crunching nerds. Someone saved a few pennies by using a low torque starter motor and an over complicated compression release system.
You know, I had a case bolt come loose on my MS280 Stihl and it broke some fins on my flywheel. $80 later for a new flywheel and it cuts great. I did remove those bolts and gave them a shot of lock tight. Thanks for your videos.
Don’t have Facebook, hate social media..but love RUclips and watching your informative and funny ass show..and the unsolved mystery is fantastic. Lmao. Oh yeah and give shop rag a job..
thank you, another solution to an issue i haven't run across yet, now thanks to you Taryl and Elk i won't have to spend two days scratching my coconut, Thank you! :)
They said it was running rich, but I think they just mean it was making that distinctive “banging” noise like it was running rich. That sometimes happens if a valve is too tight so it doesn’t close, or in this case where the compression release was stuck. Since he could cover the carburetor with essentially no vacuum forming, I’m guessing the release is on the intake valve, so all the compression was pushing back through the intake manifold and the net air flow through the carb was essentially 0.
@@artemovsk1 I believe the compression release is always on the exhaust valve(s) because the engineers wouldn't design an engine with air/fuel mixture/exhaust gasses being blown back out the intake/carburetor. The loss of suction on the intake is probably because air is being drawn back into the cylinders through the exhaust pipe/muffler.
@@sewing1243 That isn't always true, the newer briggs single cylinder lawn tractor engines have the compression release on the intake and I'm sure others do too. Normally the blow back through the carb isn't a problem when starting because the release closes so quickly, but in this case it isn't closing. Most older engines had the release on the exhaust, but some newer ones are starting to be on the intake.
Just saw this the other week. After a while of scratching my head as to why my tecumseh horizontal 10hp was popping and surging around. Turns out compression release was sticking. Thanks Grass Rats
Taryl always makes me laugh but when elk skin laughs at him that makes me laugh more. Love it when he says Taryls line....fire it up and Taryl tells him him to shut up. You guys are hilarious!!!
I'm glad Taryl did something with the chainsaw, even though we'll probably never find out what really happened to it. Good job on the cam shaft repair.
At 22:35 there is a lightweight casting that is supported by the Crankshaft and has weights hanging from it. What exactly does it do? Part of Dynamic Balancing?
Great video love your sense of humour. What do think would cause a Kohler command to lockup bought it used with crack in oil pan have welded up but now it ain’t turning over
I agree. That piece is very thin and flat, and with a little bit of oil on it, it could easily stick between the gear face, and the CR counterweight. I would have slid a business card in between there right away, and gotten my flashlight out 😃
All they have to do is fast forward,or rewind to there liking. If they don't know tap the screen this cool little slide bar comes on screen wow move it how and where ya want. I love the kids keep up the good work.
That's what I am thinking or push the weight in and grind down the lifts on the exhaust cam lobes so that they will be even with the cam lobe... Just a thought from a 35 + year mechanic from the back yard... Lol
Yeah I’m sure it can but when T was looking at the cam when he removed it the CR was stuck open...it should have been disengaged. I think something else is going on. Like I said in my earlier post I would like to have seen the flywheel key too.
@@garny3766 I went and looked at the video again to make sure before replying. When T pulled out the cam and turned it over the weight was stuck and it was stuck close to the shaft and the compression lift pins were sticking all the way out holding open the valves as it went around. That is seen in the video plain as day. Another thing a guy could do is weld the weight in the out(open) position so the lifts do not stick out and hold the valves open. Just a thought! ME: I would have ground down the lifts and reinstalled the camshaft and got lunch... Lol LLAP P.S. I have one of these engines and if this happens, that is what this 67 year old mechanic is going to do... :-) $200 bucks my buck teeth..... :-D
Bruce Scott Humm I just watched again and @ 11:09 you can see his left index push counterweight back towards camshaft (that’s the first click sound) in essence turning “on“ CR. It does appear the lift pins are sticking up until he cycles the CR a few times though🤔
Another good video. I was looking for a video to show me why my kRohler command 25 just like that one blew oil out of the breather and all over my exhaust 😭. Lots of smoke almost fire. A lot of oil. I have just finished rebuilding the carbintrator and don’t know if I defiantly plugged the breather hose back in but surely it still shouldn’t dump all it oil everywhere?
Good video. ..future videos would be great to see how you reseal the crankcase and how long you wait until you fire it up!!! I guess it would depend on which product you use
Hey Teryl,going to try to install rings on a ch25 kohler,wondering if and what would I have to do to make it a ch750 if possible?one more thing what is the difference between a and b pistons? Couldn’t find a video on it.thanks love your Chanel.
20:55 I seen the resistance. You sure it don’t need the compression release? Oh wait you did say something about it at 21:55 My 16 year old is working on a Kohler command 27sp and we started it today but it doesn’t really idle unless choke is part on . Digging into it . He has straight pipes on it.
Taryl I have a shop like you I had one I’ll share with you we had a cc gtx2100 with the horizontal version command and it ran very similar but lean and hot, after 5 minutes the exhaust would be glowing orange we changed everything you could think of. We then found the horizontal version commands had a pressed on cam gear on the crankshaft well apparently they are known to occasionally slip causing the cam timing to go off. Midwest super cub sells a kit to correct this problem otherwise Kohler wants you to replace the entire crankshaft. Just figured I’d share that one with you since it really was making us scratch our heads for a wile.
Trying to understand all that a stuck compression release would effect. Loss of compression for sure. Could it cause backfire ? Also, would it run LIKE it was rich or would it really be running rich ?? Really good mystery video, you have solved much of the small engine mystery for me Taryl. I have fixed and tuned up all of my own machines thanks to you. Love your channel.
It'll usually run with the release stuck. It'll just have no power. It lowers the compression ratio drastically but it has to have enough compression to fire and run at startup.
Nice throw back to my childhood sunday night TV program. And that little oil sucker. You got a link to that? That looks to be a very handy tool to have handy.
Hi so I have a kohler ch26. Its a command pro efi were one cylinder runs so hot the muffler glows yellow hot. Would a bad cam do that or a hung exhaust valve?
Taryl, was hoping you could answer a question for me. I have a Kohler CV15S engine and cannot locate where the regulator/rectifier is on this engine. The videos I have watched show one in the corner of the engine shroud, but mine has a plate there. Does the engine have a regulator/rectifier and if so, where is it? Thanks for your help.
Can't wait for the update where they find the reed valve piece between a piston skirt and cylinder wall. It's in there somewhere. Might be sandwiched in the compression relief though.
A pal that runs a mower shop has had TWO of these with bad LOBES! One was a Scrub Cadet with 80 hours on it. Ran rough when NEW. Might be like GM with the bad batch of cams years ago.
Taryl, I have a Hustler Raptor SD with the Kohler kt740. I am having issues with the engine running rich too. I did a full service on the mower engine. oil, filter, plugs, and swapped out the carb. The issues I was having is the mower suddenly lost power while mowing. Lots of black smoke. This all happened while mowing. I pulled the valve covers, and found one of the rocker arms broken. I replaced the rocker arm, and adjusted the valves. They were all loose. After fixing the rocker arm, the mower starts almost instantly, but still has no power and spits out tons of black smoke while at full speed. Idle is fine. you can visibly see all the fuel being thrown into the carb causing it to spit and sputter. After doing the towel test. the mower slows down, but does not stall. I am at a loss and don't want to tear the mower apart unless i have to. any ideas. Thanks. All the videos are so helpful and awesome. Keep up the good work.
Very good video. Can you do a video on a Kroller Command V-twin horizontal shaft governor replacement? I have a Scrub Cadet GT2550 shaft drive that I believe needs a governor gear.
I'm thinking that the missing sock that eludes us between washer and dryer is somehow related to this crime but merely speculation on my behalf...promoted by one cold foot .hmmm
I had one like that so I grabbed the governor and held it wide open until it unstuck gave it a oil change and has been running good without tearing it apart
Taryl's so experienced he expects his gut to tell him the diagnosis. But an amateur needs basic checks like cranking compression and leakdown test. Those would have helped show low running compression but good cylinder sealing at top dead, which should have hinted at the bad compression release.
Could this kind of thing happen to a 35hp Vanguard horizontal shaft engine? Because no matter how much the adjustment my Go-Devil mud motor it would run really rich the spark plugs black after running for 20 minutes.
I recently bought a non running GT5000 with one of these engines. After seeing so many of Taryl's videos on the many and various problems with the Kohler Command V twin, I think I'm going to just replace the engine with a good old Kohler Command single cylinder engine, even though it's only a 17 hp.
Yeah but they CAN have simple problems that are easy to fix. My command pro 25 from the 90's on an Exmark has 1700hrs, and has only had a blown head gasket. It is so strong i didnt realize the head gasket for a year, then a mouse chewed the coil wire and made that cylinder stop contributing what little power it was putting out. Then it would run on one but die when i switched on the blades.
@@bw1841 I got this one for $250 a couple months ago. It's in excellent condition, but for its engine problem. It's the geared model, not a hydrostat. Previous owner said it broke down, he took it to a repair shop, who said it had a blown head gasket. So they put new ones on. THen those blew also. So he was done messing with it. My original intent was to see if I could fix the 25hp, but after watching some of Taryls videos and others on the MANY problems with these Kohler Twins, I'm not sure I want to even try. Which is why I figure I'll put the 17 in, to get it out of my shop, then toy with the 25 later. And who knows, it might work fine with the 17 single cylinder Kohler Command. I have another Craftsman, a LT1000 that had a 17hp Intek that threw its compression release. While waiting for the new parts to come in, I put in an old 11 hp B&S flathead engine and it ran and mowed fine with it, though it could not power through high grass as well as the original 17 could.
I have DGS6500 Kohler command vtwin. Hit the bottom on a hill, now it sounds like crap. Pulleys, belt, and sparks good. Sounds like banging metal on one side every time piston out position while running. Haven't checked coil or opened up case yet, (I don't wanna!). Please help!
Well that’s weird, those command v twins in my experience are some of the best engines. I always see them with 2000+ hours of use in a commercial setting and they run great. I guess it depends on how much maintenance they get. I probably would have been working on that for days to find that issue. I’m going to start inspecting all the reed valves on the command units I work on. I think I’m going to start stocking those reed valves and on any of the machines with over say 500 hours, I’m going to recommend the customer change the reed valves. Thanks taryl.
Same thing happened to my Craftsman/ Briggs, broken compression release on the camshaft. Figured it out after I replaced the battery and starter and 2 starter gears.
Hey taryl I've got the exact same mower I'm working on. Problem is it will idle but as soon as I bump the throttle it runs more than full throttle. Rebuilt the carb and fuel accelerator. It ran perfect for about 5 seconds. Then it backfired and now I'm having this problem. Any ideas? Maybe the governor?
New one on me compression relief issue on a V-twin would have had me scratching my head too. on the other hand I've seen plenty single intek engines with the counter weight in the sump.
Taryl, do all small engines today have compression release ??? You said that Briggs changed the design of the compression release three times ??? Maybe a fourth time is in order ???? I prefer the old engines. They were made with longevity in mind. Thanks Taryl for letting us all know on RUclips of this problem too. VF
The older ones have it to exept briggs which used a bump machined into cam lobe for compression release. It was trouble free,as long as the engine was properly maintained!
Most of the reed may have come out with the oil, being black it would be hard to catch. I’ve never seen that happen before and would have stumped me too. Love your channel.
Guys, I had a similar issue and it’s still has me a bit puzzled. Toro 1128 OXE snowblower. Complaint was the machine was low on power. I pulled out the gas, put in fresh non-ethanol fuel. No fix. Found the carb leaking from the body, bad casting I assume. Replaced carb, no leak but still had original issue. I checked valve adjustment, they were both loose. Adjusted to Briggs spec, no fix. Then the machine wouldn’t start, I was getting intermittent spark. Pulled flywheel and found sheared key. Replaced key, got it running, still same original issue. At this point I’m scratching my head-a lot! Since the engine had a pretty bad oil leak I figured I would pull the sump cover to take a look inside. What I found is the puzzle I don’t understand. The cam timing was off 16-teeth from the crankshaft. I called the owner and asked if anyone worked on the machine before me. He said it was the first time anyone has touched it since it was new. Camshaft was fine so was the crankshaft. I realigned the shafts properly, inspected the governor, lifters, pushrods. All was ok, sealed her up, oiled her up.She started up right away but hi-speed was only about 3K RPM. Adjusted both idle and hi-speed and she ran perfect. How can it run or even start with valve timing so far off? This issue owned me for a week!
Support the channel! Grab yourself a Taryl T-Shirt, Coffee Mug, Tools & More! Shipping Worldwide Daily from the Taryl Apparel online store!
www.TARYLFIXESALL.com
Gotta hand it to you man!... you put a LOT of effort into these videos AND you go the extra mile for your customer!
The music is my favorite
No shit, I wish Taryl was near me. I've got an Exmark Lazer Z with an oil leak that I'd take to Taryl!
So this exact thing happened to me on my 23hp command. The biggest give away was the non stop clattering of the intake lifters and compression on each cylinder was 100 and 120. So I pulled the cam and nothing appeared bad, but what I ended up doing since this mower was cheap and don’t want to buy a cam and don’t have a spare. I broke the counter weight and rod mechanism for the compression release and welded the compression release so the mechanism would not longer move into the compression release position and bam 180 compression on both cylinders and after 15 minutes of running lifters bled and runs like a top. Once again Taryl, coming from a small engine repair expert, thanks for sharing this, becuase this is definitely a out of the ordinary small engine issue
This was one of your most enjoyable videos. As a retired instrument mechanic and electrical foremen, this was a prime example of my philosophy, no matter how aggravating "the tough ones are the ones you learn from".
MY FAVORITE SHOW! UNSOLVED MOWER MYSTERIES!
Can you imagine Robert Stack making a Cameo appearance!
@@maj8301 Aa!!
This guy needs a Netflix show
Excellent, in-depth walk-thru of the issue with the engine. That seems like a few hours (at least) spent trouble shooting. But you fixed it...because Taryl Fixes All!!!! Great job. Now, time to celebrate your success and purchase some Taryl apparel. Thanks again!
Hi Taryl I just subbed to your channel Utube just recommended you out of the blue. I have been watching several of your videos and love your zanny comedy and your extensive knowledge and know you are the real deal, there is so much garbage on utube but your channel is totally genuine. I used to own a small engine repair shop in northwestern Saskatchewan, Canada in the 1980s I was a large Stihl dealer also a Suzuki marine, BCS and Homelite Jacobson, and Kawasaki small engines. In the later years I worked for a full line Honda dealership repairing motorcycles, Honda automobiles marine and small engines. I then went to work for a provincial run tech school as a instructor in the OPET program, Outdoor Powered Equipment and then to a medium sized rental company repairing everthing the from large gen sets to Genie and Skyjacks and power trowels , jumping jacks to chainsaws and cutquicks. I then retired in my mid sixties and sold off my tools. Cheers from north west Canada.
Perfect timing for my morning coffee :) You guys are the best!!
You crack me up taryl. You go to a lot of trouble to keep us entertained. Love your videos. Keep up the good work!
This would have me going for days. Thank you for posting this.
Stay well, Joe Z
Good video, Thanks for including Elk Skins. We need more videos with him.
@@gfriedman99 that's how I was watching it. Lol. Elk Skins is my damn hero.
LOL, another great video. Got to love those engineers and number crunching nerds. Someone saved a few pennies by using a low torque starter motor and an over complicated compression release system.
Taryl is an American treasure. Podunk’s finest
You see there Scooter, he thinks of the simplest things first
You know, I had a case bolt come loose on my MS280 Stihl and it broke some fins on my flywheel. $80 later for a new flywheel and it cuts great. I did remove those bolts and gave them a shot of lock tight. Thanks for your videos.
Don’t have Facebook, hate social media..but love RUclips and watching your informative and funny ass show..and the unsolved mystery is fantastic. Lmao. Oh yeah and give shop rag a job..
Great fix Teral! Saved that customer alot of money
The guy paid for the processes that did not work also --up until success
thank you, another solution to an issue i haven't run across yet, now thanks to you Taryl and Elk i won't have to spend two days scratching my coconut, Thank you! :)
Taryl good investigative work.
I believe I have the same mower with the same problem right now.
You grass rats are the best !
Great episode, I got that same tractor with the 24 HP Koehler engine, it’s 25 years old.
Excellent video, thank you. I have the same engine running rough and blowing black smoke. I'll check to see if the carb is sucking air...
Roscoe Jenkins! 24:13 That mug shot is hilarious!
Yep almost seven feet tall
I'd like to see if that little piece of crap from the reed valve is in the compressione release. Thank God for Sunday Taryl mysteries.
dident see that coming,
They said it was running rich, but I think they just mean it was making that distinctive “banging” noise like it was running rich. That sometimes happens if a valve is too tight so it doesn’t close, or in this case where the compression release was stuck. Since he could cover the carburetor with essentially no vacuum forming, I’m guessing the release is on the intake valve, so all the compression was pushing back through the intake manifold and the net air flow through the carb was essentially 0.
@@artemovsk1 I believe the compression release is always on the exhaust valve(s) because the engineers wouldn't design an engine with air/fuel mixture/exhaust gasses being blown back out the intake/carburetor. The loss of suction on the intake is probably because air is being drawn back into the cylinders through the exhaust pipe/muffler.
@@sewing1243 That isn't always true, the newer briggs single cylinder lawn tractor engines have the compression release on the intake and I'm sure others do too. Normally the blow back through the carb isn't a problem when starting because the release closes so quickly, but in this case it isn't closing. Most older engines had the release on the exhaust, but some newer ones are starting to be on the intake.
It seems more and more with kohler engines I don't see it coming lol,
Or going?
You da man Taryl. Another great video, brought to you by,"Grass Rats Garage" Whooooooooooooo.
Outstanding analysis. I have this engine on my year 2003 Craftsman GT5000 lawn tractor.
Just saw this the other week. After a while of scratching my head as to why my tecumseh horizontal 10hp was popping and surging around. Turns out compression release was sticking.
Thanks Grass Rats
Brilliant, love from the UK
Taryl always makes me laugh but when elk skin laughs at him that makes me laugh more. Love it when he says Taryls line....fire it up and Taryl tells him him to shut up. You guys are hilarious!!!
I'm glad Taryl did something with the chainsaw, even though we'll probably never find out what really happened to it. Good job on the cam shaft repair.
Thanks for the dinner. How about a video on adding electric start to a pull start engine..
1200Custom 1974 Agreed... that would be a good one.
on most builds this will be unavailable/impossible
At 22:35 there is a lightweight casting that is supported by the Crankshaft and has weights hanging from it.
What exactly does it do? Part of Dynamic Balancing?
This was a cool idea for a skit. Great Video!
WOW I'm a little late ,, but this is ,,,,, YOUR BEST VIDEO SO FAR ....Thx Ed Loretto Ontario Canada
Great video love your sense of humour. What do think would cause a Kohler command to lockup bought it used with crack in oil pan have welded up but now it ain’t turning over
Hey Taryl, check the oil filter for pieces of the reed valve. another great video.
exactly what I was thinking,however he did say that the oil pump has a screen on it, I would still tear the filter pleats apart and look for filings.
Love these guys .😅 Hats off to taryl fixes channel
I am just wondering if a little tiny piece of a that reed is semi lodged under that compression release somewhere.
I agree. That piece is very thin and flat, and with a little bit of oil on it, it could easily stick between the gear face, and the CR counterweight. I would have slid a business card in between there right away, and gotten my flashlight out 😃
Crap love the channel when u went woo I did too forgot I had guests at my house freaked them out now there binge watching your channel awesome
Good demo, and how about that same mower keep blowing fuse. What do suggest. Thanks.
I had the same problem. Turned out to be the electric clutch.
But if yours doesn't have the electric clutch, there is a short in the wiring somewhere
That pink suit coat is GOLD! Ya little twerp!
I have to admit, when I'm mowing on my Cub Cadet, I find myself yelling "Taryl Dactyl Here"!!
does the 20 hp v twin camshaft have a decompression
All they have to do is fast forward,or rewind to there liking. If they don't know tap the screen this cool little slide bar comes on screen wow move it how and where ya want. I love the kids keep up the good work.
I like the oil drain pipe
I wonder if the compression release parts on the old Kohler Command camshaft could be removed, and reinstall the shaft without those parts?
That's what I am thinking or push the weight in and grind down the lifts on the exhaust cam lobes so that they will be even with the cam lobe... Just a thought from a 35 + year mechanic from the back yard... Lol
Yeah I’m sure it can but when T was looking at the cam when he removed it the CR was stuck open...it should have been disengaged. I think something else is going on. Like I said in my earlier post I would like to have seen the flywheel key too.
@@garny3766 I went and looked at the video again to make sure before replying. When T pulled out the cam and turned it over the weight was stuck and it was stuck close to the shaft and the compression lift pins were sticking all the way out holding open the valves as it went around. That is seen in the video plain as day. Another thing a guy could do is weld the weight in the out(open) position so the lifts do not stick out and hold the valves open. Just a thought!
ME: I would have ground down the lifts and reinstalled the camshaft and got lunch... Lol
LLAP
P.S. I have one of these engines and if this happens, that is what this 67 year old mechanic is going to do... :-) $200 bucks my buck teeth..... :-D
Bruce Scott Humm I just watched again and @ 11:09 you can see his left index push counterweight back towards camshaft (that’s the first click sound) in essence turning “on“ CR. It does appear the lift pins are sticking up until he cycles the CR a few times though🤔
this guy definetaly earned my sub
Another good video. I was looking for a video to show me why my kRohler command 25 just like that one blew oil out of the breather and all over my exhaust 😭. Lots of smoke almost fire. A lot of oil.
I have just finished rebuilding the carbintrator and don’t know if I defiantly plugged the breather hose back in but surely it still shouldn’t dump all it oil everywhere?
Lol i love the voices you do. Where's the compression release? o there it is. 😂😂😂😂😂😂😂😂😂
Good job Taryl thanks for sharing
Good video. ..future videos would be great to see how you reseal the crankcase and how long you wait until you fire it up!!! I guess it would depend on which product you use
I'd watch the whole unsolved mower mystery series lol
Hey Teryl,going to try to install rings on a ch25 kohler,wondering if and what would I have to do to make it a ch750 if possible?one more thing what is the difference between a and b pistons? Couldn’t find a video on it.thanks love your Chanel.
What cam from what engine did you get that cam out of I need a cam like that for my engine
20:55 I seen the resistance. You sure it don’t need the compression release?
Oh wait you did say something about it at
21:55
My 16 year old is working on a Kohler command 27sp and we started it today but it doesn’t really idle unless choke is part on .
Digging into it . He has straight pipes on it.
As always love your videos!!!
Nice job good investigation into the problem
DAM SAM..you are king of U tube
Dang, 3 tries, so many hours. I would have set the damn thing on FIRE haha.
Reckon you earned your money on that one. Or lost your shirt. And there's your dinner (off the dollar menu). I appreciate the diagnostics and sharing.
Taryl I have a shop like you I had one I’ll share with you we had a cc gtx2100 with the horizontal version command and it ran very similar but lean and hot, after 5 minutes the exhaust would be glowing orange we changed everything you could think of. We then found the horizontal version commands had a pressed on cam gear on the crankshaft well apparently they are known to occasionally slip causing the cam timing to go off. Midwest super cub sells a kit to correct this problem otherwise Kohler wants you to replace the entire crankshaft. Just figured I’d share that one with you since it really was making us scratch our heads for a wile.
Trying to understand all that a stuck compression release would effect. Loss of compression for sure. Could it cause backfire ? Also, would it run LIKE it was rich or would it really be running rich ?? Really good mystery video, you have solved much of the small engine mystery for me Taryl. I have fixed and tuned up all of my own machines thanks to you. Love your channel.
It'll usually run with the release stuck. It'll just have no power. It lowers the compression ratio drastically but it has to have enough compression to fire and run at startup.
Nice throw back to my childhood sunday night TV program. And that little oil sucker. You got a link to that? That looks to be a very handy tool to have handy.
Great work Grass Rat King.
Hi so I have a kohler ch26. Its a command pro efi were one cylinder runs so hot the muffler glows yellow hot. Would a bad cam do that or a hung exhaust valve?
Taryl, was hoping you could answer a question for me. I have a Kohler CV15S engine and cannot locate where the regulator/rectifier is on this engine. The videos I have watched show one in the corner of the engine shroud, but mine has a plate there. Does the engine have a regulator/rectifier and if so, where is it? Thanks for your help.
Fantastic diagnosis
It it wasn’t for you I wouldn’t have a job. Thanks Taryl!
Can't wait for the update where they find the reed valve piece between a piston skirt and cylinder wall. It's in there somewhere. Might be sandwiched in the compression relief though.
A pal that runs a mower shop has had TWO of these with bad LOBES! One was a Scrub Cadet with 80 hours on it. Ran rough when NEW. Might be like GM with the bad batch of cams years ago.
I love your skits!
Taryl,
I have a Hustler Raptor SD with the Kohler kt740. I am having issues with the engine running rich too. I did a full service on the mower engine. oil, filter, plugs, and swapped out the carb. The issues I was having is the mower suddenly lost power while mowing. Lots of black smoke. This all happened while mowing. I pulled the valve covers, and found one of the rocker arms broken. I replaced the rocker arm, and adjusted the valves. They were all loose. After fixing the rocker arm, the mower starts almost instantly, but still has no power and spits out tons of black smoke while at full speed. Idle is fine. you can visibly see all the fuel being thrown into the carb causing it to spit and sputter. After doing the towel test. the mower slows down, but does not stall. I am at a loss and don't want to tear the mower apart unless i have to. any ideas.
Thanks. All the videos are so helpful and awesome. Keep up the good work.
Very good video. Can you do a video on a Kroller Command V-twin horizontal shaft governor replacement? I have a Scrub Cadet GT2550 shaft drive that I believe needs a governor gear.
I'm thinking that the missing sock that eludes us between washer and dryer is somehow related to this crime but merely speculation on my behalf...promoted by one cold foot .hmmm
i have a 17.5 command .. single cylinder doing the same thing .. have you seen one of them stick ?
I had one like that so I grabbed the governor and held it wide open until it unstuck gave it a oil change and has been running good without tearing it apart
This would be the same thing that would happen at my shop. Having to pull that engine three freaking times......
It's like the bullshit never ends. Lol
Taryl's so experienced he expects his gut to tell him the diagnosis. But an amateur needs basic checks like cranking compression and leakdown test. Those would have helped show low running compression but good cylinder sealing at top dead, which should have hinted at the bad compression release.
Could this kind of thing happen to a 35hp Vanguard horizontal shaft engine? Because no matter how much the adjustment my Go-Devil mud motor it would run really rich the spark plugs black after running for 20 minutes.
Finally got on your channel.Thanks for the viedo's
I have a Command that is running really rough and rich right now. Was going to start with the carb, going to check the airflow first now.
Thats some fine detective work..very interesting video..i have a mystery of my own..to be shared at a later date..
Excellent video!!!!! Never seen that before!!!! You guys rock!! 🍺🍺
Any idea on how to check the camshaft endplay on a kohler command pro? I know i need a special tool of some sort but cant find it anywhere
I recently bought a non running GT5000 with one of these engines. After seeing so many of Taryl's videos on the many and various problems with the Kohler Command V twin, I think I'm going to just replace the engine with a good old Kohler Command single cylinder engine, even though it's only a 17 hp.
Yeah but they CAN have simple problems that are easy to fix. My command pro 25 from the 90's on an Exmark has 1700hrs, and has only had a blown head gasket. It is so strong i didnt realize the head gasket for a year, then a mouse chewed the coil wire and made that cylinder stop contributing what little power it was putting out. Then it would run on one but die when i switched on the blades.
@@bw1841 I got this one for $250 a couple months ago. It's in excellent condition, but for its engine problem. It's the geared model, not a hydrostat. Previous owner said it broke down, he took it to a repair shop, who said it had a blown head gasket. So they put new ones on. THen those blew also. So he was done messing with it. My original intent was to see if I could fix the 25hp, but after watching some of Taryls videos and others on the MANY problems with these Kohler Twins, I'm not sure I want to even try. Which is why I figure I'll put the 17 in, to get it out of my shop, then toy with the 25 later.
And who knows, it might work fine with the 17 single cylinder Kohler Command. I have another Craftsman, a LT1000 that had a 17hp Intek that threw its compression release. While waiting for the new parts to come in, I put in an old 11 hp B&S flathead engine and it ran and mowed fine with it, though it could not power through high grass as well as the original 17 could.
Absolutely love the parody!
I have DGS6500 Kohler command vtwin. Hit the bottom on a hill, now it sounds like crap. Pulleys, belt, and sparks good. Sounds like banging metal on one side every time piston out position while running. Haven't checked coil or opened up case yet, (I don't wanna!). Please help!
Well that’s weird, those command v twins in my experience are some of the best engines. I always see them with 2000+ hours of use in a commercial setting and they run great. I guess it depends on how much maintenance they get. I probably would have been working on that for days to find that issue. I’m going to start inspecting all the reed valves on the command units I work on. I think I’m going to start stocking those reed valves and on any of the machines with over say 500 hours, I’m going to recommend the customer change the reed valves. Thanks taryl.
There's your Dinney
Another good performance thanks guys
TARYL ALL DAY EVERYDAY FIXES EVERYTHING
Have you done a complete rebuild on the command V twin..25-27hp?
Same thing happened to my Craftsman/ Briggs, broken compression release on the camshaft. Figured it out after I replaced the battery and starter and 2 starter gears.
Hey taryl I've got the exact same mower I'm working on. Problem is it will idle but as soon as I bump the throttle it runs more than full throttle. Rebuilt the carb and fuel accelerator. It ran perfect for about 5 seconds. Then it backfired and now I'm having this problem. Any ideas? Maybe the governor?
What do you set the valves at with no compression release ? It’s going to lock up on startup with no compression relief
New one on me compression relief issue on a V-twin would have had me scratching my head too. on the other hand I've seen plenty single intek engines with the counter weight in the sump.
Taryl, do all small engines today have compression release ??? You said that Briggs changed the design of the compression release three times ??? Maybe a fourth time is in order ???? I prefer the old engines. They were made with longevity in mind. Thanks Taryl for letting us all know on RUclips of this problem too. VF
The older ones have it to exept briggs which used a bump machined into cam lobe for compression release. It was trouble free,as long as the engine was properly maintained!
@@randallcarney1216 Thanks for letting me know Randall. VF
Most of the reed may have come out with the oil, being black it would be hard to catch. I’ve never seen that happen before and would have stumped me too. Love your channel.
love to buy you guys a beer fun place to work
Guys, I had a similar issue and it’s still has me a bit puzzled. Toro 1128 OXE snowblower. Complaint was the machine was low on power. I pulled out the gas, put in fresh non-ethanol fuel. No fix. Found the carb leaking from the body, bad casting I assume. Replaced carb, no leak but still had original issue. I checked valve adjustment, they were both loose. Adjusted to Briggs spec, no fix. Then the machine wouldn’t start, I was getting intermittent spark. Pulled flywheel and found sheared key. Replaced key, got it running, still same original issue. At this point I’m scratching my head-a lot! Since the engine had a pretty bad oil leak I figured I would pull the sump cover to take a look inside. What I found is the puzzle I don’t understand. The cam timing was off 16-teeth from the crankshaft. I called the owner and asked if anyone worked on the machine before me. He said it was the first time anyone has touched it since it was new. Camshaft was fine so was the crankshaft. I realigned the shafts properly, inspected the governor, lifters, pushrods. All was ok, sealed her up, oiled her up.She started up right away but hi-speed was only about 3K RPM. Adjusted both idle and hi-speed and she ran perfect. How can it run or even start with valve timing so far off? This issue owned me for a week!
Good job as always.... there's your dinner
I like that "Stihl an unsolved mower mystery" great video guys! When is the next follow up show?
Keeping up with the Mowdashians