Fixing A Lawnboy Mower That Won't Change Engine Speeds
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- Опубликовано: 5 янв 2023
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Thanks for watching. I needed to adjust the engine speed, on this engine but turns out
the design makes it quite difficult.
This video is meant as entertainment, always practice safety. 
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I'm a mechanic and the first step is always verify the complaint. It has nothing to do with if I trust the person or not.
Yep they’re a pain to work on. I have a tc 300 series that uses an air vein governor. If you can order a new spring, I suggest that you order one or lock down the throttle in rabbit speed & do away with the throttle cable
great advice
really unique mower. solid condition too.
Sure is!
I've had some carb issues with my Duraforce too, by the way that ribbed wheel under the air vain can be spun independently of it to adjust the tension on the spring. This video couldn't have come out at a better time! I'm working on my Duraforce too lol
Edit: I really should have watched a few seconds longer before commenting. I will post a link to a video in a separate comment that has some helpful info on the dial.
I really appreciate the help.
Had that mower since new early 90's, worked in a landscaping business for 20yrs, never had a single problem except a front wheel, and one of gears in tranny finally went. Bought a temporary 1 speed trans off eBay until i can find the proper one. Which is what I'm looking for now. Point is, best mower you will ever own. If ya get a chance to buy one and it's in decent shape, don't hesitate. Working on it once or twice over a 25yr span is well worth the trade off.
yes these are fantastic mowers to use commercially just so long as you have some spare parts. Thank you!
This job that u do is my dream and I watch you every day keep up these amazing videos
excellent, this type of work, can be very rewarding
Totally different to the Victa 2 Strokes we have in Australia
that's what I've heard.
yes, I would want one especially after using my friend's old one this past summer, I thought it was way cooler than my 90s 4 cycle lawn boy.
me too!
I'd take what I could get and be glad to get it! Briggs made those 6+ horse I/C 2-cycles that had to be the toughest rig anywhere. Thanks and you'll get it! BLESSINGS!
Couldn't agree more!
As much of a pain as a Honda ! Nice save sir 👍
Tell me about it
Picked up my first one this fall and had the same issue. For me it was that the spring had slipped out of the slot in the top of the governor blade. Worth checking while your in there.
thank you Robert Baysinger.
You can adjust the governor with the carb on by spinning the wheel at the bottom of the air vein arm. It's a good design.
thank you
That knob on the air vane adjust the rpms by about 50 or so for each click. Clockwise to increase, counter clockwise to slow it down. Duraforces spec about 3000 rpms but that is too slow in my opinion. I own 2 of them and run them both about 3400 rpms.
thank you I appreciate the information
I agree!
I love Lawn Boy 2 stroke mowers. I've been using them for about 40 years. The one I have now I bought new in 2003 for $350.
It is wonderful. It starts easily after sitting over the winter months, 1-2 pulls. It's 6.5 hp engine is very powerful and easily plows throught the highest, toughest grass, i.e., Bahaia. Also, no oil changing. Just mix oil with gas and that's all the lubrication the engine needs. Besides all that, mine is one of those with an aluminum deck, light weight and no rusting out.
I love my Lawn Boy and am sad that they were bought out by Toro, who ruined them. The 4 stroke versions with the stamped out steel decks were garbage.
yes the new ones are a different animal compared to the 2 strokes from 25 years ago. Keep it going and you'll enjoy it for another dozen years!
That Round Dial Is Able To Move To Adjust The Speed , You Should Be Able To Pull Up Or Push Down & Turn ( Not 100% Sure )The Round Bit & Turn It To Adjust The Speed . Either Left Or Right. It Allows More Air & Acceleration. It Adjusts The Governor Vain
thank you Jon Lambshead.
@@HomeGaragechannel Let Us Know If U Fixed It By What I Said PLS
I absolutely will.
Well, here coming to the 2023 end of season. Neighbor gave up on his 10323 and handed off to me. Problem was that famous hunting and surging. Solution after 2 yrs in storage. Ever so lightly drilled the carb main jet more just like a honing. Perfect now 👍🏼 Many out there said they did everthing to no success. Free it's good.
nice work!
This is why I went to trade school and have been a certified OPE tech and master service technician for 30 years. OK, so no need whatsoever to remove the carb or mess with the governor spring. The dial on the throttle shaft is how you adjust engine speed. Use 2 fingers to turn it counter-clockwise to increase engine speed to 3300 RPM, turn it clockwise if speed is too high. 15 second fix, on the spot, boom just like that. I love your videos and all, but this one had me doing a real face palm.
nice, your career path is very envied!
@@HomeGaragechannel Hardly, it's a crap job that busts your body and offers almost no reward. That reply was either sarcasm, or simply misplaced envy. I am glad I am nearly retired, although it'd be nice if I could still walk properly and still had feeling in my hands and wasn't hacking up phlegm from all the chemicals and grinder dust inhaled...
@tjclarke4604 do you mean to loosen the bolt holding the throttle up on the handle then turn it and snug it up?
@@MidnightPolaris800 No on top of the carb there is a little dial you can adjust with your fingers, it clicks, and you can tighten the governor pring (or lossen it) whichever you need to do.
I believe it's CW to increase speed. 50 RPM per click. You want 2900 RPM +/- 300 RPM.
I love my 2 stroke lawn boys. I have a 7268 I'm planning to rebuild. i was able to get it running, but it started slowing down and died. Would not restart. Did a compression test and only got maybe 60. I have a NOS piston, rings, and seals for it, The carb kit was done already.
Very nice, hopefully the cylinder wall is still good.
@HomeGaragechannel if not I do have another f series!
I have one of these and 4 other older models. They were so easy to repair but mine have never broken yet. The carbs are literally so easy to rebuild and the parts for them are still available and cheap
yes these are very good engines indeed. too bad there's so few left.
@@HomeGaragechannel not for me, there’s a place that I go to that has a whole variety of selections who strictly only sell 2 cycle lawnboys. They take junk ones and restore them back to show room condition. I can restore certain things but the machines that they use and the space they have to powder coat the frames is the only reason I’ll buy from them because you want automotive type paint on those fiberglass or aluminum decks. Regular krylon paint peels after a while
Never owned a Lawn Boy, But had a #16785 Toro Two Cycle that used the Suzuki two-cycle, bullet proof engine. Was a bad day when the fed/gov mandate to cycle mowers out of business. Had I been thinking I'd bought up a couple when they were available so I'd have one today to use.
I understand how you feel.
The federal government never mandated 2 strokes go away. They mandated emission standards that were only going to get more stringent over time. Toro and other manufacturers didn't want to spend millions in R&D to tackle just how to make burning your engine lubricant a clean process. Which is not a simple problem to solve. It's a lawn mower, not the space shuttle after all and the mower market is very competitive. But now, I see folks spending $1000 on battery powered walk behinds. Never would have believed that. I have several of these LB 2 strokes that go back to the mid 1960s. They still run great.
I don’t know anything about this problem but still enjoyed watch this video.
I appreciate your time either way. thank you Growing Little Country homestead.
Love it, keep up the great work😇
Thank you! Will do!
If it were mine, I'd do away with that overcomplicated vane setup and implement a simple friction lever for speed setting and separate homemade choke linkage, pressure washer style.
ah nice idea.
More trouble than it's worth, the air vane governor is super reliable, if you gotta change the spring once every few decades, so be it.
Strange governor set up. Turning the adjuster either way should fix the problem.
so for that's what I've heard.
Great video my friend!
Thanks for the visit
I can only imagine how much hp I could tweak out of a 2 stroke that big
me too, some porting would wonders
I would like so see that.
@bleach_drink_me If i get my hands on one, I will, just for fun. 42cc 2 stroke chainsaws make over 3+ hp right out of the box. Bump the compression a bit, clean up the flows, free up the exhaust, bigger carb... now I need to think about something to put it on, maybe a go cart. 😁
@Home Garage I am going to shop around Dallas for a donor motor. This is a bad idea, that's my favorite kind of idea. 🤣
@@GuysPlayingWithTools hope you find one for reasonable price.
Hey bro what's up? I'll pass on owning a 2 stroke mower. It appears to be more troublesome once working on it yourself.
I understand the feeling.
I wouldnt mind haveing a 2 stroke mower, it would have to be older than that one to avoid all those plastic parts.
very true
For those who came here for carb spring adj: From manual: Note: Each “click” of the governor collar represents
approximately 50-75 RPMs.
1. Turn the collar clockwise to increase spring tension
(and engine RPMs) or counterclockwise to
decrease spring tension and RPMs. (See Figure
39.) Preset the governor collar 3 or 4 clicks
clockwise.
thank you for the information
Love these mowers.
me too
Jon3800’s favorite
if I recall they are, he seem so enjoy it.
I've been doing some brainstorming on how to get aftermarket lawn boy duraforce carburetors to work because I'm having issues with mine, I think I finally cracked it! My old carb dumped gas into the engine and on the deck, and the new one isn't jetting right. The plan is to take the jets from the old one and swap it on the new one. Maybe this is me being stubborn though, haha
let me know how it works out
@Home Garage it didn't work, I just put the old carburetor on with the needle from the new one and it works great!
I just bought on e of these and way better than my POS Troy bilt that threw a rod.
these definitely have their good points
The splined wheel under the air vane turns and can be adjusted
thank you!
I had a 10323. Good mower. Needed cables and i also had a couple other duraforce gold series mowers so I ended up selling it rather than throw more money at it.
nothing wrong with that, thank you for sharing
Dad had an old 2 stroke one, it lasted 30 years with minimal repairs, It didn't rev real high so the engine lasted on it.
nice!
Older ones didn’t have high rpm’s
I would love to have an old lawn boy if it was self propelled and had an aluminum deck and came with a chute and a bag. Just for the nostalgia really. I used to used these from time to time when I was a kid working for my neighbor. I always found lawn boys to be cool mainly because of the 2 stroke engine. I never really cared for the right front wheel being off set or the bag set up on the side. It made the mower bulky and hard to maneuver and cut in tight spaces. While I love 2 strokes these lawn boys seemed to lack a little bit power compared to the 4 strokes when it came to cutting the really thick tall grass. Maybe I'm wrong but that's what I remember.
yes that reminds me I need to get mine going
@HomeGaragechannel I also remember that they were not that easy to start when cold. I had two neighbors, who both owned a couple of lawn boys actually. They always took at least a few pulls to get started when cold.
I love 2 smokes and this system seems a bit complex but when it works life is great and when it doesn't you get this pain. If this was mine and I was trying to fix it I think I would just put a manual throttle control on the handle.
that's a good idea.
The throttle won't work that way. All engines that encounter varying loads MUST have a governor of some kind to maintain rpm at varying loads. The governor on these is the air vane. Higher RPM sends more airflow over the vane closing the throttle, slower speed means less air over the vane and the spring closes the throttle. If you hard connected the throttle cable to the throttle plate, everything would seem fine until you encounter even the slightest load on the engine and it would bog down until the load goes away and it would eventually go back to the previous no load rpm.
I have an Australian built Victa 2 stroke lawnmower which l.foumd on the side of the road a few years ago & it over revs because the governor relies on crankcase vacuum & the crankcase O rings & seals leak air so it Only runs at full speed & stop speed !
wow nice diagnosis
As I recall, there is a procedure to “clock” the spring. I have a 1991 model, and have yet to figure it out satisfactorily.
thank you Jim.
You can buy a replacement spring. They are still available. I replaced one a few years ago.
thank you Bert Buchanan
yep i would not mind using one if i lived over there or working on them and if i needed to replace the carburetor aka carby i would simply do it as it,s easier after doing a good thoro cleaning and carefully re-assembling etc.
these are getting hard to find but they're definitely worth a shot.
thank you Patrick Stapleton!
Turn the round dial below the air vain. One direction will increase idle speed, the other direction will decrease idle speed, you will feel the wheel clicking to different position, takes a bit of force. This can be done with engine running. Note: turning wheel while running moves vain . I.E when turning wheel and vain makes engine rev up, and you feel the wheel click to new positon, your actually turning idle speed down. The opposite is also true
thank you very much for the information
The plastic gear knob below the air vane sail can be turn either direction to adjust the throttle spring. Thus control the engine speed. I heard the lawnboy engine can run at 4000rpm. The two stroke engine always runs faster. I did rebuilt one that they have a steel sleeve cylinder while the Briggs and Stratton four stroke flat head is aluminum cylinder. The old lawnboy have needle bearing on the crankshaft . That's why the old lawnboy two stroke run faster yet last .
thank you for letting me know, I appreciate it
Hello Home garage Happy New Year how was your Christmas I think you should get a new spring to put on the carb
Thank you Paul Burns, as far as the spring, that would be a great idea, the problem is, I'm not sure, if they sell it individually
I would adjust the drive cable to slow it down and keep the engine rpm the same.
hmm.. interesting idea!
Looks about as painful as working on Victa 2 strokes that we have in Australia, so much plastic and o-rings used in them, they have air leaks and revving issues all the time.
I think they only good 2 stroke that was ever used on lawn mowers is the Suzuki 120cc, we have them on Rover mowers here but they were used on Toro mowers in the USA as well.
ah man I miss a good Suzuki 2 stroke.
In my 15 years of fixing and flipping mowers I still have not run across one of these.
interesting, you mean you don't even see them for sale used?
@@HomeGaragechannel I have seen a couple for sale and they were expensive. I have never found one while out picking and no one has ever brought me one. I have never seen one in person.
The dial adjust the spring tension turn it to increase/decrease speed
thank you!
I will pass on one of these🤣😂🤣
completely understand why.
The Lawnboy mowers are built like tanks. They just keep on going.
you're right about that.
Good morning
Good Afternoon
Good afternoin
morning!
I know that this is a lawn mower video, but would you do a spark plug wire replacement on a generac XT8000EFI
if I can find one, I most certainly will.
Honda 4 stroke OHC fanboy here. Two stroke engines are very finicky when it comes to adjustments and keeping constant RPM. Having to deal with mixed oil/gas is also an additional chore. Honda 4 stroke engine mowers seem to fall apart all around the engine, generally wheels, drive belts/mechanisms, cables which IMHO seem easier to deal with. Love these videos and the thought process used to repair the equipment. Keep up the excellent work.
thank you for the information
make some long studs and thread them into the side and then stack the gsk, plate, and carb on. take out one at a time and replace with the bolts
unfortunately with the design of the governor flap, and clearances, studs won't work but it's a good idea.
hey i need some help i have a 2stroke lawn boy im fixing right now and i put a new carburator on it and when you change the speed from choke to any other speed it stalls and you can only move the throttle lever a couple centimeters before it stalls (the throttle valve on the carb works like it should when you change speed)
I see, more thank likely you'll need to adjust the knarled ring on top of the carb, either that you'll need to confirm the the throttle and the slide on the back side of the air box is moving at its should. This part is the worst thing about the 2 stroke lawn boys.
@@HomeGaragechannel i messed with it and now it starts on choke and runs fast but when you move it to slow it stays on slow and sometimes when you move it to fast it revs up for a second then comes back to idle
not good, I feel for you, this is the trickiest part of working on these machines.
Lawnboy. Never seen one that looks like that.
these are special in my book
I recently purchased a 10324 and im in need of the speed adjustment lever you called slide and im having trouble locating one, do you know where i can get one and would you happen to know the part number? Thanks in advance
here's link and it looks like you have to buy the whole thing.
amzn.to/44x0YZa
Adjust speed at the wheel on top of spring 3 or for clicks at the time
thank you !
I enjoyed the 2-stroke engine when I was younger, but we didn't do any of the repairs to it. So I have no idea how to fix this one.
makes sense
Hey got a question for you and the people in the comments. I'm about done with my small engine class and going to start a small business. What tools should I need to acquire first to start off successful
thank you Danial Gilstrap for the question.
For me, I would get a large tool set. Something in the 200 piece set.
Also the brand, doesn't matter.
After that, a good variety of power tools, impacts, grinders, and it doesn't matter if you go air or battery powered. Then focus on all diagnostic tools like compression tester, leak down testers, spark, and for good measure
an ultrasonic cleaner.
Wow. So many afraid of the unfamiliar...
it's only natural
Can anyone help me on this? I compression tested a warm briggs flathead mower with hand pull starts and it yeilds a lousy 60psi. However.. Using a drill to spin the flywheel, the compression gauge outputs 105psi. The mower seems to run fine but I like to take photos of the gauge for proof of it's condition when I sell it. Any help would be appreciated.
your numbers are spot on, when comparing pull rope readings to drill readings.
It shows the engine has some wear but is still enough to run.
Ngl, I would've expected a fan based governor (the spinning dual flag thing in music boxes) on the engine shaft.
Does the filter need to be dry or soaked in oil?
all foam air filters need to have oil in them.
mr garage, can you help me find out what's wrong with my mower? i have a ride on mower with a briggs model 28 engine, 12.5hp, it simply does not want to start 100% of the times, most of the times it just spins and shoot flames through the carb, but does not start, the flywheel key is intact, i checked like 40 times and i can't find what's the problem, i also honed the cylinder and put new rings but the issue persists
sure, please check the valve lash
@@HomeGaragechannel yeah so it's about 0.80mm for the 2 valves, the piston rings are about the same gap, is that ok for a lawnmower engine?
sounds like it's too much.
have you looked up the specs for the valve lash for that engine?
@@HomeGaragechannel actually i couldn't find a manual anywhere
I have the same machine only has a fuel tank leak any ideas? All ready tried Soldering but runs well.
is it a "visible" leak, or does the just disappear from the tank? if so the carb's needle and seat are the problem.
It is visible from the tank. checked carb
sure, a crack, bad fuel line, or there's a break in the tank, along a seem.
Wish I was tech. savvy so I could advertise My Silver Series self propelled two cycle Lawnboy mower in excellent condition. Just needs carb work. Have no use for it Just sits in my storage unit.
you could always try "word of mouth" to advertise it.
Eliminator Performance has a great video on how to adjust these, it's called "How to Adjust RPM on a Lawnboy". As they get older, they also need the idle jet drilled out a little larger with a micro drill bit #78 (0.016") for a smoother idle.
My Lawnboy started hunting (loping) all of a sudden, not over time. At all speeds, not just idle. I thought maybe the gaskets were leaking air but maybe I should try the drill.
Tecumseh and Suzuki definitely had much better designed 2 stroke engines compared to this, those engines do have governors on them like a 4 stroke and they aren’t any more difficult to adjust than one.
thank you for the information
Who would have thought that a little spring would cause so much trouble. 🤦🏾♂️🤦🏾♂️🤦🏾♂️🤦🏾♂️🤦🏾♂️🤷🏿♂️ #stihlpower #stihlisyourdaddy #stihlrunstheyard
I know right.
I have a very similar issue mine won’t crank high on hot idle but the idle goes in and out on cold start and the stop won’t even,work I have to turn off the fuel to turn it off
interesting issue. Have you tried looking into it yet?
@@HomeGaragechannel tried adjusting the idle multiple times and tried adjusting the lever spot and try doing a full service and nothing yet and I’m getting flustered cause I got 2 other projects to do aswell(my blowers)
2 problems. Follow line fron safety start bracket. It grounds spark to shut off mower. Clean jets and check governor spring.
I'd have left it alone and listed that only runs on high speed. I've had a couple of those come through, 1 sold for parts and 1 went right to the scrap yard. Around here, they don't sell, so aren't worth the time and parts to fix them. Good luck!
makes sense
Your childhood trauma shows you still like these old mowers. It's ok.
Trauma build character, up to a point of course. But it does make us, what we are today.
You're playing on hard mode. Apparently, you can turn the plastic gear to adjust the position of the air vein.
yes, that's what some of mentioned already. At least I'll know next time. thanks again!
Oh s*** this is a two-stroke? That would explain why I can't get the thing started I have one put gas in it and I'm like it wants to start but won't 🤣 I picked it up for $10 bag is in decent shape
oh man, glad you figured it out.
Not a fan of this mower in particular. I just don’t like the way it sounds. That’s probably a dumb reason, I know. 🤷♀️ Thanks for your time, HG.
not a problem, it's like comparing the sound of an RX8 to a comparable V8 car. Some just prefer one over the other. thank you A Patterson.
ruclips.net/video/GswQYrEFCVY/видео.html
This is the video for the dial! Hope it helps!
thanks!
I freakin hate these machines with a passion but I also can't deny the money that they bring all fixed up. I had one with a similar issue and I reached out to @KensSmallEngines here on youtube and he walked through about the adjusting carb via the knob.
he sent me this video and look at the 2:48 mark ruclips.net/video/EwicpzQqN5M/видео.html
thank you I appreciate it!
Sadly Lawn Boy missed the mark. I do like good two strokes. Toro and Jacobson made good along with some other brands.
Great point!
Dude i seen the supra is it yours?
I have a few mower can you fix them for me
unfortunately not right now.
Where is air filter
the air filter is the foam piece
Two stroke engines have more torque, great I. High or wet grass😊
Great point!
No thank you. I’ll stick with Brigs.
Or Kohler or Honda or Kawasaki...anything but 2 stroke.
@@burntflowerzfallen I would rather have a two stroke but the old flathead Briggs run forever two strokes no valves no camshafts no valve adjustments lighter weight simpler design
@@hunter7476 I don't see the appeal and having to mix gas and oil every time I need to cut my grass. Two strokes are loud and unnecessary in a lawn mowing application. Chainsaws on the other hand.....
@@burntflowerzfallen alright I see your point sir honestly the two strokes and four stroke lawn mowers are fiskry quiet and if your wearing hearing protection what’s it matter the chainsaws scream and are loud besides with a two stroke there ain’t any oil changes either and really you can by two stroke fuel with out any ethanol for your equipment 2 stroke push mowers are obsolete not common and have been replaced by better engines but the simplicity of design and reliability is still very good I just think it’s a cool thing to see and they sound cool I wouldn’t want to use one all day though lol
I’ve never seen a 3 wheeled mower that looks like it’s been in a car crash.
No I wouldn’t want that mower.
lol.. It's got 4 wheels the 4th is offset for better grass discharge.
@@HomeGaragechannel I’m going blind 😂😂😂😂😂
I can see why those mowers are no longer made.
makes sense doesn't it.
Air filter
what about it?
Nope I hate lawn boy 2 cycle mowers had a old one and did everything that I had to do it exploded the head in pieces and it was just a the shop 2 days prior for low rpm
hmm.. never heard of that happening before, sorry to hear about that.
@@HomeGaragechannel had to be defective or a bad casting and what they turned up the rpm it blew apart
No I don't think so I'll pass
nothing wrong with that.
No 😁 No reply needed just a statement.
thank you Curiosity
Worst mower I’ve seen. Crappy carb and off set wheels. 🇦🇺
it does make things kind of strange to work on.
First thing i would do is scrap all the govenor stuff and make the carb 100% manual choke lever and throttle lever .
that's a good idea.
Why do people think this brand is so great? I'm no expert with them but from most of the models I've seen they seem to be pieces of 💩. I was given a no spark silver series with bag. It was a decent mower but I didn't need it so I sold it. Different doesn't necessarily mean better and these things are just funky.
thank you K Kc.
Great video, I do like the old 2 stroke Lawn Boys but they can be a pain to work on because of the carb and governor design.
Great point! thank you WildeFox.
Easiest things to work on