Fixing A Lawn Tractor That Pops & Backfires!
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- Опубликовано: 28 авг 2024
- Fixing A Lawn Tractor That Pops & Backfires!
Does your lawn tractor pop and backfire when it warms up? Watch this video to see what may be your problem and how to fix it yourself.
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Easy to follow and thorough step by step tutorials do it yourself (DIY) to help you with your broken lawn and garden equipment including snowblowers.
I do my best to teach you how to easily diagnose problems the fastest, quickest and most efficient way with real repairs beyond just replacing a spark plug. These tips are for both the homeowner and shop owner.
Whether it be a handheld, two stroke, two cycle engine like a chainsaw, weed eater, weed wacker, string trimmer, grass trimmer, line trimmer, hedge trimmer, strimmer, brush cutter, leaf blower, or four stroke, four cycle units like a lawnmower, wood splitter, lawn tractor, snowblower, pressure washer, generator or a ride on mower that needs parts installed or replaced, I’m your go-to guy.
My favorite brands of spark plugs are NGK and Champion and are the ones I recommend.
I’ve been a small engine mechanic for many decades and also run my own repair shop so my videos are loaded with tips and tricks that I have learned and want to share with you. You will also find many tool and product reviews from top brands on my channel as well.
I have the largest Small Engine Repair Video Library on RUclips and the entire internet with over 1200 videos, just GOOGLE "DONYBOY73"!
I want "DON THE SMALL ENGINE DOCTOR" on RUclips to save you time, frustration and most importantly, MONEY with my HOW-TO videos!
Due to factors beyond the control of DONYBOY73 “The Small Engine Doctor”, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. DONYBOY73 “The Small Engine Doctor” assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. DONYBOY73 “The Small Engine Doctor” recommends safe practices when working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of DONYBOY73 “The Small Engine Doctor”, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not DONYBOY73 “The Small Engine Doctor".
#donyboy73 #db73 #smallenginerepair #howto
Too bad you have to give common sense safety tips. I’m 65 and started working on lawn mowers when I was 9. Have all my fingers and still have my marbles!!
I just turned 63 and I started when I was 10. And I still have all my fingers and toes. I never could understand how anyone could get hurt. All you have to do is use what god gave you.
Duke's World agree!!
yes butr you should still use caution when using dnagerous tools and chemicals im 14 and very careful but i still wear eye and ear protection and gloves when doing certain work its not a bad idea to practic saftey and he is not have to give it out the saftey tips he just wants to be safe
First things first: safety first! Was one of the first sentences my 2 year old spoke
@@hunter7476 here is the difference your 14 they are in their 60s I will agree with the 60 year olds I am 35 most should be common sense like keep hands out of moving parts and safety glasses if needed the key removal if your the only one in your shop you know not to start it if other people are remove it common sense
That is so cool Dony! Over 35 years ago, I took a small engine course with my Dad at a local high school in the evenings. The Instructor showed us that trick of using a business card to set the coil gap! I have never forgotten it! So cool to see you doing the same thing so many years later!
Have been watching your videos for a while now, and used 3 or 4 of them the other day to diagnose hard starting/missing issues on craftsman lawn tractor. Did a valve adjust, choke adjust and sanded down the flywheel magnet and re gapped the ignition modules. Runs great now.. thank you so much Don... your videos are very straightforward and easy to follow.. much appreciated!!
I have a 22 Hp OHV Briggs and It is doing exactly what that engine is doing. It also has a dead spot and backfiring when accelerating. I have replaced everything twice but not the coils, Thanks Don, I NOW know its problem. I will not miss that backfiring, Thank You Again Don. Great Videos, Great Work.
You are the best on the Internet!You get “right to it”&its about the work as it should be!not you or your hair or clothes or the weather or cameras or music blasting.Very thorough&very relaxed paced.
I have a friend with a Dixon ZTR with a Kohler engine and he is having these same symptoms! I'm totally gonna fix his mower now with knowledge that I have gained from Donny the small engine guy! Thanks, Donny!
Appreciate your thorough clear approach to your vlogs Don. Its always a pleasure picking up tips & tricks in such a relaxed tutorial. 🤙Northern Territory Australia 🇳🇿
greetings from Canada
This is a very helpful video. It was clear, concise, and not overly long. The camera views are excellent. Good job.
I've had coils completely fail when hot,then work when they cool down. I like Kohlers,but genuine parts are EXPENSIVE here in the States.Nice catch Dony.
Great video, have a craftsman with a 22hp Briggs had a spark but would not run , so I thought that with any spark it should run ? Well bought that tester after watching ur video review. Boom barely a spark changed coil , they only have one purrs like a kitten. That tester is great and I learned something. Thanks Donyboy and have a great day. Keith
Thank you so much for your help with this matter. I'm confident in my ability to replace the ignition modules.excellant video.
I have a Troy built model similar to this one with a B&S engine, has the same characteristics, so thanks to you for showing us the issue, I still have to check out my key switch, it doesn’t always want to start it. Thanks again Donny
Great video Don.
I'm here because my 15 year old CV20S on a Dixie Chopper suddenly started doing what yours did but much worse. Pulled the cover (what a PITA!) and found one of the spark plug wires chewed halfway through right at the module. New ones on the way.
Thanks for showing the procedure so clearly and the great tip on those testers. Never heard of them.
Thanks for this excellent video.
I always thought a coil was either good or dead but I learned the hard way and from this video that is not necessarily so.
I tested both coils on my V twin and both were in spec.
Like you, I initially thought the carb was the problem, but even a new carb didn't fix it.
My engine was surging badly and would backfire as well.
It wasn't until I saw this vid and I got a spark tester that I was finally able to diagnose the problem as a bad coil
I have a lot less hair now but with the help from your video I FINALLY got it fixed.
I was told taught they work or they don't. Sometimes you get one that will work when it is first started, but then after it gets warm it would quit. I see now that there is more to it. I learned something new today. Very cool video.
Thanks for the help I changed mine out and it now run great
Never knew a module could be weak. Thought it either worked or not. Great video
@Paul Zacher
- Now you know! It's called " Electrical Leakage ". During usage, the Module gets " hot ". In the Module, the Wires might melt through time and it create a small shortage / electrical leaks. This would make the Module weak, since electricity find the closes ground to get to. :)
@@staind288 he has a video that he has said it is rare but there are exceptions to it.
me either
Some modules use a microprocessor to advance the ignition timing for high rpms. Sometimes that can go bad and make the engine run terrible at full throttle. Though the opposite was happening here in which the engine was running poorly on low throttle.
i replaced one tha thad burned thru till it finally quit it was just running on 1 cylinder
Again... just what I needed to know! Thanks Don! This is the best on the Net!
Just a great informative video. You clearly explain everything and the camera work is great for those of us who learn better by seeing it be done. All your videos are so helpful, thank you again. I save money and learn at the same time.
Thanks for all the vids you do Donyboy, I had a feeling it was coil related after you mentioned the popping and poor running, seen it a few times in chainsaws and mowers etc, I like the inline testers, that's a great bit of kit and cuts out the guess work as such and confirms it is indeed coil related. I will have to let my mate know about them and see if we can source some here in Australia.
check ebay also
Good technique resolving the tractor problem, and a great tip for us once again. Keep these kind of knowledge sharing videos coming, we enjoy them a lot. Thanks you!
Good Coil diags. Sometimes a twin cyl with one bad coil can mislead you to believe you have a carb issue.
FYI, I'm an industrial Printer and most business cards are printed on 100# uncoated stock or 10 point..or .010 of an inch paper which is 1000 of an inch. So to confirm a business card has a gap of 1000 of an inch. Spot on donboy !!
.010 is ten thousands .001 is one thousands .....
isn't that correct ?? Thanks 😉
@@waylonmccrae3546 you are 100% correct and thank you for the correction, 10 point paper is actually 10/100th of an inch
@@greenmarine5 all good .... wasn't trying to be a smart butt , but as someone who loves to build engines that just caught me funny when
.001 can be the difference between a successful rebuild , or scrap metal failure !! 😎
Its so nice to come back and see you again. There are so many mower repair videos now that I've been away for awhile. But I've come back please forgive me. I shaltn't ever desert you again.
Thank you Don once again. I've watched many of your videos and learned something from every one. Your approach, knowledge and quality of the videos is fantastic. Is there a way to create a "Library" of your videos? Hope to hear from you.
you can create your own playlists
Very informative vid, thanks Dony. Your camera work is always superb.
Thanks this totally makes sense, testing the coil was erratic when testing the resistance, but it started and ran. I was thinking the carb, but it looked really clean, and did not have a kit to rebuild, so I am waiting on that, I guess I will get a new coil as well.
Thanks!
Great job diagnosing the problem, that why I like watching your videos. Could you use a 12v test light to do that?
I’m hoping you do a video on that Honda snowblower in the background.
You could, but someone has to turn it over for you.
Donny, since I've been watching your channel, I have purchased those inline testers. I use them all the time even though nothing seems to be apparent. I've gotten a few tractors that the coils were so bad and if it wasn't a fuel issue then the coils are the culprit..Keep the videos coming.
Very nice video, thanks for explaining how parts work.
You are the best, happy to learn a skill each time watch your repair video. thanks a million. I just fixed a compression release issue on the Craftsman mower, but it still has to turn over 4 turns before starts. It has weak spark as well. I may put a new coil to it. Vancouver Island, Dale
Good video. It’s very hard to see the difference on the tester lights for me. You might want to re phrase the “positive wire” description on the coils. It sends a ground signal to those coils to kill the engine
"COMMON SENSE"??? Common sense only comes from experience and mistakes; no experience, no mistakes, no common sense. I started working on mowers when I was 62, and had no common sense about them because I had never worked on them. Now one year later, I have accumulated a lot of common sense about mowers because I have worked on about ten of them doing all the basics - engine timing, carb. cleaning and adjustment, valve adjustments, valve cleaning, gasket replacements, diagnosing, kill switch repairs, flywheel removal and key replacement, head removal and cleaning, gas tank cleaning, ground fault repairs, bolt torquing, coil diagnosing and replacement, valve seat repair, and more.
A lot of my common sense also comes from watching and learning from great mower mechanics like you, Dony Boy, and a FEW other really good ones on RUclips. Thank you.
Your advice about not over doing it on the bolts at 5:48 is very good advice. I can't tell you how many bolts I've broken because I thought everything had to be SUPER tight like a gorilla on steroids was turning the wrench.
That was my problem with plumbing issues. I'm not allowed to work on faucets around the house anymore.
Great video just in case…..during the summer I was that idiot that replaced the fuel filter and I put it on backwards and my engine performance obviously failed multiple times as I was driving it and I couldn’t figure out why.. I know better now…
But this is another great idea what could be going on
So I have a Cub Cadet that hesitates and runs slow until it warms up. It makes the exact same sounds you recorded in this video. Could these coils be the problem?
Thank you for the video that's exactly what is going on with my mower
Is it my imagination or does Kohler seem to have more issues with ignition coils than other manufacturers? And I agree those testers are a must have.
I believe you are right. I've had more problems with ignition coils going bad on Kohler engines than any other brand.
It's because of Dual Coil! They don't catch each other soon enough... One Coil over worked the Other, that is when you see this Problem. V-Twins are the worst.... Although they did it to gain extra Power, but the concept of it sucks. So many People have these problems because of V-Twins. Only way to fix this is to have a Distributor Cap..., like in the Cars / Trucks. But since this is a small Engine, no point of have a Distributor Cap.
I dig your disclaimer! Keep fixing them Dony Boy! I actually heard the difference while typing my comment! 😊
Wow, very informative and helpful vid, thanks Donny! I had a similar coil failure on a small Tecumseh LEV-120, it would start just fine but then as it warmed up it would pop and lose power then eventually die out. New coil fixed it right up, guess a winding went open or something.
Ok tyu very much I will check out your vids for repairs, I'll keep you updated on my progress.
You mentioned removing and reinstalling the small (positive) wires on the ignition coil. Are they not (negative) or ground wires that make a connection to ground when the key is turned off?
Thanks man my mower is doing the same thing and all these idiots I take it to can't figure it out. Again thanks great video
Great information as usual Don. I feel like your apprentice. Greeting from Australia. Bloody heat wave here.
What a GREAT lesson! I will remember that one. How old were you when you started learning? Was it a family member or did you just figure things out on your own?
Many thanks!
Smashing, that customer will notice a hell of a difference :-D
I had forgotten about breaking down ignition coils, so easy to forget when we don't repair engines all the time like you do, good thing you teach us again :-D
I suppose the insulation on the coil must crack with heat and the odd spark escapes to a lower potential coil winding, no spark for the eht cable :-(
Thanks for the gumball Mickey 👍
Nice I have a craftsman 7000 Delete series, with a the kohler motor KT745 26cc . Doing some of the same thing ,when I Engage the blaze it starts to bog down ,I have to get 2 of those babies also.
Hey Don, always learning a lot from you. Great videos.
Those tester's are time saver's
Thank you same problem
Another very well done and informative video. Thanks. One question, did you check the gap on the bad coil before you removed it?
yes
I did not know you were up there in Canada until this video.
A video on changing out the Transmission Fluid in a “Sealed” transmission on a little lawn tractor (ie. John Deere LA series) could be a good video to do. Overall process of getting to the concealed ‘fill’ plug.
Finally a good old repair video.
Can I get in contact with you Donyboy
Thanks!!! Looking forward to fixing my riding lawnmower.🙂
Another good one DONYBOY. Will definitely get one of those spark testers. 👍👍
Those Kohler engines are awesome. Cub Cadet uses them in their line of lawn tractors.
He is a hardworking peasant.
Great video. Thank you. I will be doing this job very soon.
Great video very thoroughly explained I never knew there was a tester for the ignition coil like that !
thanks donny i just bought a sears 30 inch hydro rider!!!!!!!!!!!!!
Big difference good job
I'm guessing the one dislike is from the customer 🙄😂 , nice detective work. One of the good things about videoing the fault finding is that the customer can see what you did to diagnose the problem, and how you fixed it 👍. And even though he was wrong on his guess , you still cleaned the carbs before you investigated further.
i don't mind if they see, and i do charge less than other shops
Thanks for the great video! I just this week had a Cub Cadet tractor in for the same problem and it turned out to be that mice chewed into the coil and the primary wire.Told customer he needs to do some rodent control so he does not have this problem again.
To prevent mice chewing on Wires in Lawn Mower and Cars.... Take your favorite " Cologne " and spray on the Engine / Fins / Wires / Etc.... When the Engine gets hot, it smells good for you and Mice don't like the scent! Musk is also good for it, since it's like an Animal Scent.
yes, very clear tutorials, thank you
Hey Dony, another nice video. Lately just about 1 out of 3 tractors I get have damage due to rodents. Stay well, Joe Z
To prevent mice chewing on Wires in Lawn Mower and Cars.... Take your favorite " Cologne " and spray on the Engine / Fins / Wires / Etc.... When the Engine gets hot, it smells good for you and Mice don't like the scent! Musk is also good for it, since it's like an Animal Scent.
Nice video. Good information for diagnosing a rough running engine,
I never knew the ignition coil would cause popping. I always thought that was a valve issue. I learned something, I have a 17 hp single cylinder Briggs engine. It was popping and backfiring, I adjusted the valves exactly according to specs and still have issues when it gets hot. Sounds alot like this engine did but it doesn't hesitate?? Do you think it's the coil on it or do I need to check the valves again?
You are a genius thanks Danny
Thanks DB73
Great job as usual.
I need to get a set of these testers.
Auto parts stores or Amazon or EBAY has them. They're called in- line spark testers.
Thanks for that great info. I have a John Deere x300. It looks like there is only one ignition module. Is that possible? Thank you
Another great solution. Thanks
Excellent video. You make it look so easy.
Good job looks.lije you made right desicion to change both coils the other one looked week too keep them videos coming
Thanks for another great video! I appreciate you sharing
Thanks Don , good lesson !
Thanks Don for another great video. It looks like you put the second coil upside down. Does it matter?
Good advice
Nifty little spark tester. Thanks for the video!
Very good work. I really need a second spark tester. I can see that. 👍
Thanks for a informative and to the point video 🙂
Quess what donyboy, i broked my Briggs lawn mower pull cord today. Well it lastet almost 50 years, so it's time to get new cord in it. It happened because there was tall grass and few smashed apples wich choked the mower, and when i started to pull that starting cord, it snapped. Well i'm gonna watch that video where you fix the pull cord in old Toro rototiller with 5hp Briggs engine. Lets see if i learn anything.
Kohler makes a great engine. Nicely done!
Ours does not stay idle, backfires and chokes a lot so hopefully this will fix it
Question.. how does a positive wire kill spark?
Those are negative, ground wires! Very informative video though!
Good diagnosis. I thought those were ground wires on the coil, not positive.
jim s yes that's what l thought, so what are those? + or -
Easiest way to test for safety switch or ignition switch problem is to disconnect them.
If it starts and runs while disconnected,you have a switch problem (seat,clutch/break,blade engage,ignition ect.)
It's a " Positive " coming out of that Coil. You are using the Wire to " Ground " it. So People calling it " Kill Wire / Ground Wire ". But in reality, it's a " Positive " that you are referring to.
@@paulbillings1791 - 100% !!!
Those wires ground the coils when the ignition is turned off, killing the spark. Works just like smaller engines that have the ground wire on the throttle lever. When moved to stop position, the wire is grounded killing the spark.
Thanks Don Great video
Great "EDUCATIONAL" Video!👍
Good video but that is a negative ground wire not a positive wire.
We have had running issues with the new Briggs and Stratton vanguard engines. These have a EFM unit fitted (Electronic Fuel Management) to the carburettors to automatically choke the engine. These units and the wiring have to be checked as its this system that can be at fault not the carburettor. Everyone else like the Kohler, Kawasaki or Honda haven't decided to fit these, units yet.
well i tried replacing both mags no better pulled carb cleaned very little dirt etc. still popping i tried spraying some brake clean in carb smooths right out? Going to do a compression check next any ideas seems like it may be lean??
Thanks
If the customers don't believe you, they can watch your videos! :D
That was a great video very concise and easy-to-follow good job
Great fix Donny.
Thank you very much for sharing you knowledge
Got a small Briggs, 4.5 or 5.5 hp that is doing the same thing. Cranks fine but surges and backfires. Replaced the carb but same thing. You may have solve the problem. Any idea of a part number for a new coil?
Pretty smooth
Excellent instructions and video