Fixing A Lawn Tractor That Pops & Backfires!

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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.
Watch my video review on spark tester used in video here;
• TOOL REVIEW - Inline S...
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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.
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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".
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5 окт 2024

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Комментарии : 356

@dmoore7519 4 года назад

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!!

@dukesworld3020 4 года назад

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.

@dmoore7519 4 года назад

Duke's World agree!!

@hunter7476 4 года назад

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

@kismetcorp 2 года назад

First things first: safety first! Was one of the first sentences my 2 year old spoke

@flyinryan1986 2 года назад

@@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

@Rattletrap2 2 года назад

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!

@jayneescher4945 6 лет назад

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.

@cliffmeadows6721 6 лет назад

This is a very helpful video. It was clear, concise, and not overly long. The camera views are excellent. Good job.

@BobSanchez-h9s 11 месяцев назад

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!!

@p.a.f.mitasol8071 6 лет назад

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 🇳🇿

@donyboy73 6 лет назад

greetings from Canada

@grosseileracingteam 6 лет назад

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.

@MrDaveR-uq7iq 6 лет назад

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.

@localcrew 6 лет назад

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!

@jesseramos6124 6 лет назад

Thank you so much for your help with this matter. I'm confident in my ability to replace the ignition modules.excellant video.

@keithfrisell4271 6 лет назад

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

@daphlavor 6 лет назад

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

@jimwoodward4243 5 лет назад

Thanks for the help I changed mine out and it now run great

@paulzacher5672 6 лет назад

Never knew a module could be weak. Thought it either worked or not. Great video

@JodBronson 5 лет назад

@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. :)

@truckinchihuahuaalvieschre2494 4 года назад

@@staind288 he has a video that he has said it is rare but there are exceptions to it.

@billydugie8922 4 года назад

me either

@tier3rd375 3 года назад

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.

@frankdavidson9675 3 года назад

i replaced one tha thad burned thru till it finally quit it was just running on 1 cylinder

@ChuckD59 5 лет назад

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.

@fred306801 3 года назад

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.

@billkrause4585 4 года назад

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!

@vanguy9780 2 года назад

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.

@kjay5056 Год назад

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.

@FishTales-Reel-Life-Adventure 4 года назад

Again... just what I needed to know! Thanks Don! This is the best on the Net!

@Chris-Fennimore 6 лет назад

Good Coil diags. Sometimes a twin cyl with one bad coil can mislead you to believe you have a carb issue.

@scottryan5369 6 лет назад

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.

@donyboy73 6 лет назад

check ebay also

@breeze787 5 лет назад

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.

@sebastian56309 6 лет назад

Very nice video, thanks for explaining how parts work.

@tonym6920 4 года назад

Very informative vid, thanks Dony. Your camera work is always superb.

@kahealanikealakai555 4 года назад

Ok tyu very much I will check out your vids for repairs, I'll keep you updated on my progress.

@bradc.4334 3 года назад

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.

@donyboy73 3 года назад

you can create your own playlists

@ermannodangelo1062 6 лет назад

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.

@lyndelbeckwith1706 5 лет назад

You could, but someone has to turn it over for you.

@zachcam797 2 года назад

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?

@greensfarmland 3 года назад

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!

@rooseveltrobinson4192 2 года назад

Thank you for the video that's exactly what is going on with my mower

@osbornebay944 5 лет назад

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

@ScottMiller-tu3gg 4 года назад

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?

@mikejones6974 5 лет назад

I dig your disclaimer! Keep fixing them Dony Boy! I actually heard the difference while typing my comment! 😊

@360Prairie 6 лет назад

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.

@chrisbcritter6112 6 лет назад

That was my problem with plumbing issues. I'm not allowed to work on faucets around the house anymore.

@davidball3081 3 года назад

Thanks!!! Looking forward to fixing my riding lawnmower.🙂

@sameoldmphymel 6 лет назад

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.

@MichaelTJD60 6 лет назад

I believe you are right. I've had more problems with ignition coils going bad on Kohler engines than any other brand.

@JodBronson 5 лет назад

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.

@ToddHudson-u2y 11 месяцев назад

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

@Colt3854 5 лет назад

Great information as usual Don. I feel like your apprentice. Greeting from Australia. Bloody heat wave here.

@CdnRedneck1 6 лет назад

Hey Don, always learning a lot from you. Great videos.

@louislandi938 3 года назад

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!

@ioufk4real811 6 лет назад

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

@ccsargent 6 лет назад

Another very well done and informative video. Thanks. One question, did you check the gap on the bad coil before you removed it?

@donyboy73 6 лет назад

yes

@freedumb2010 3 года назад

yes, very clear tutorials, thank you

@mjg263 4 года назад

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.

@bigrockinu 2 года назад

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.

@billglueck9705 3 года назад

Great video. Thank you. I will be doing this job very soon.

@danielthomas3127 2 года назад

Those tester's are time saver's

@greenmarine5 5 лет назад

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 !!

@waylonmccrae3546 4 года назад

.010 is ten thousands .001 is one thousands ..... isn't that correct ?? Thanks 😉

@greenmarine5 4 года назад

@@waylonmccrae3546 you are 100% correct and thank you for the correction, 10 point paper is actually 10/100th of an inch

@waylonmccrae3546 4 года назад

@@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 !! 😎

@dinohudson1432 6 лет назад

Thanks for the gumball Mickey 👍

@peipaulT 5 лет назад

Nice video. Good information for diagnosing a rough running engine,

@lestergillis8171 3 года назад

I did not know you were up there in Canada until this video.

@gosselinsergegs 2 года назад

Thank you same problem

@FishFind3000 6 лет назад

Finally a good old repair video.

@leonpatterson7192 6 лет назад

Can I get in contact with you Donyboy

@arthurfricchione8119 6 лет назад

Another good one DONYBOY. Will definitely get one of those spark testers. 👍👍

@brianpair2934 4 года назад

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?

@armondedge8840 4 года назад

Excellent video. You make it look so easy.

@johnsamol9911 4 года назад

Great video very thoroughly explained I never knew there was a tester for the ignition coil like that !

@Smalltechguy 5 лет назад

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.

@lassila3 2 года назад

He is a hardworking peasant.

@mattb9664 6 лет назад

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.

@pyrog.c.c89 6 лет назад

You are a genius thanks Danny

@bobwelch5056 4 года назад

Big difference good job

@DK-vx1zc 6 лет назад

Thanks for another great video! I appreciate you sharing

@clarencewatkins1634 4 года назад

Thanks for a informative and to the point video 🙂

@frankmastrocola Год назад

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

@robeftyearian8760 5 лет назад

Good job looks.lije you made right desicion to change both coils the other one looked week too keep them videos coming

@marshallborder9089 6 лет назад

Thanks Don , good lesson !

@johnr.6029 2 года назад

"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 RU-vid. Thank you.

@zx8401ztv 6 лет назад

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 :-(

@CrazyCanuckFitness 2 года назад

Another great solution. Thanks

@pyro323 6 лет назад

Those Kohler engines are awesome. Cub Cadet uses them in their line of lawn tractors.

@ronwilson5906 5 лет назад

That was a great video very concise and easy-to-follow good job

@randyshelnut9676 Месяц назад

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

@mebcool 5 лет назад

Thanks DB73 Great job as usual. I need to get a set of these testers.

@hankbridges5055 5 лет назад

Auto parts stores or Amazon or EBAY has them. They're called in- line spark testers.

@dpm1964 3 года назад

Thanks Don for another great video. It looks like you put the second coil upside down. Does it matter?

@tkskagen 4 года назад

Great "EDUCATIONAL" Video!👍

@itsgalf 6 лет назад

Nifty little spark tester. Thanks for the video!

@immoegreen200 4 года назад

Pretty smooth

@velox731 5 лет назад

Kohler makes a great engine. Nicely done!

@mikerafone4736 Год назад

Good advice

@lukenesemeier5161 Год назад

Question.. how does a positive wire kill spark? Those are negative, ground wires! Very informative video though!

@canuck.2024 Год назад

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??

@rogercarrico4975 6 лет назад

Very good work. I really need a second spark tester. I can see that. 👍

@OldChief3854 3 года назад

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?

@Fireship1 6 лет назад

Thumbs up 👍! Great lesson in troubleshooting!

@fatmanbud 6 лет назад

Thank you very much for sharing you knowledge

@mrfloor1845 3 года назад

Ours does not stay idle, backfires and chokes a lot so hopefully this will fix it

@knighthawk86855 6 лет назад

Great fix Donny.

@paulmorrey733 6 лет назад

Thanks Don Great video

@theman5716 2 года назад

Hey Donny, I installed these opposite of yours that is mine have the cut out tabs under instead of on top. I mowed about 1/2 acre so far and it seems fine, Any thoughts as to do? That is should I flip them? Thanks,Tony

@Jim-ie6uf 6 лет назад

Good diagnosis. I thought those were ground wires on the coil, not positive.

@josem.2909 6 лет назад

jim s yes that's what l thought, so what are those? + or -

@paulbillings1791 6 лет назад

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.)

@JodBronson 5 лет назад

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.

@JodBronson 5 лет назад

@@paulbillings1791 - 100% !!!

@larryfine4498 5 лет назад

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.

@831Adventures 5 лет назад

Excellent instructions and video

@FSM_Reviews 5 лет назад

I don't have a tractor lawn mower, but a push mower instead. It's a Troy-Bilt TB110 with the Briggs & Stratton 550EX-Series non-primer engine. It pops some light-black-looking gas through the exhaust after I shut it down, but usually only right after engine oil changes. It also has hesitation when mowing, and when I leave it running with out cutting the grass, the entire mower jerks from side to side due the momentum from the uneven engine speeds. And, I don't know if this has affected anything, but the first time this mower was used, we accidentally set it too low of a height and the engine stalled out along with tons of thick grey smoke coming out the muffler pipe. The engine oil immediately turned grey after that incident. Is there anything that I can do to fix it? EDIT: I also hear some clanging/dinging sounds from the engine when mowing the grass. I'm already assuming the worst, but I hope someone can confirm it.

@lightallseasonlawncareexte98 15 дней назад

If my engine is searching and popping on low throttle could this be my issue? I've already replaced the carb fuel pump oil filter spark plugs air filter starter and key ignition reverse mow switch and its still doing it. Motor is the 7,000 elite series 24hp

@tomycodd 6 лет назад

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.

@JodBronson 5 лет назад

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.

@jamesmullins3219 6 лет назад

thanks. great tips. good diagnosis.

@andrewwoodward6560 6 лет назад

Nice work! Great set of testers, Thanks Don! From, Alberta.

@matthewinga9546 6 лет назад

The Octane level of our NON- Ethanol has dropped in my area from 90 to 88. It does essentially lower the prices, but is there any long term effects?

@JodBronson 5 лет назад

@MatthewinGA - My advice..., any small Engines... Stay away from " Ethanol " Fuel. Pay a bit extra, but you don't have to deal with Clogging / Cleaning / Headaches!