Simple Trick To Diagnose A Bad Ignition Module (Coil) On A Lawnmower, Chainsaw, Weedeater Etc.

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Simple Trick To Diagnose A Bad Ignition Module (Coil) On A Lawnmower, Chainsaw, Weedeater Etc. This is a hack that will save you enormous amounts of time and prevent you from buying unnecessary parts!
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Easy to follow and thorough step by step tutorials do it yourself (DIY) videos to help you with your broken lawn and garden equipment including snowblowers and zero turn mowers.
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, zero turn mower, 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". ave
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Опубликовано:

30 мар 2022

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Комментарии : 654

@donyboy73 2 года назад

Watch my video on critical chainsaw maintenance here; ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-JTCCgcopvhM.html Watch my chainsaw killer video here; ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-REqF8qeson4.html

@oliverbreanna789 2 года назад

Donyboy73 tu explicacion es completamente clear

@donyboy73 2 года назад

@@oliverbreanna789 gracias amigo! feliz noches!

@piledriver141 2 года назад

Hey Donyboy somebody is using your channel again, sent me a WhatsApp # message

@johnw1178 2 года назад

I got a WhatApp message as well. Not sure how to report it to YT!

@piledriver141 2 года назад

@@johnw1178 yeh someone trying to pull a scam. Let donyboy know

@sylvaingingras4457 2 года назад

Between you and Steve’s small engine repair, you guys saved your viewers thousands or probably millions of dollars over the years and probably many headaches! You guys rock ! I’m not one to comment much but Thank You Donnyboy for your awesome channel !

@donyboy73 2 года назад

merci Sylvain!

@josephjorgensen3282 2 года назад

Those 2 guys have helped me learn enough that I do allot of small engine repair on the side

@Sensei948 2 года назад

@@donyboy73 what distance in mm?

@donyboy73 2 года назад

@@Sensei948 .2.5mm I believe

@gradyhernandez4699 Год назад

I have been inspired more by these channels of instructions to try more

@j31355a Год назад

Some people are good technicians. Others are good teachers. You have the rare gift of having excellent skills in both areas. Let me add my thanks to the multitude of others who have already done so for your being willing to share your expertise with the rest of us.

@schuck9326 Год назад

I agree. Thanks Dony

@daleslover2771 Год назад

👍👍👍

@gradyhernandez4699 Год назад

I have started to fix,or attempt to,fix weedeater

@toonybrain 3 месяца назад

So few know this simple trick despite the numerous small-engine videos on RU-vid. Thank you for your thorough explanations.

@mousetrap13 2 года назад

Finally, a video without a life long story, succinct, accurate, direct, easy-Thank you! Xxx

@paulbush6503 2 года назад

I am rehabilitating an old horizontal twin pulled from my neighbor's woods. You are right; there are some horrible maintenance videos on You Tube. I just subscribed and liked after watching this video. Considering the amount of filth and rust I cleaned elsewhere on this tractor now I know I should check the flywheel magnets and gap and coil itself.

@mousetrap13 2 года назад

@@paulbush6503 speaking of rust, I suppose you know about molasses for non labour intensive rust removal? 1 part molasses to about 8 parts water. Soak for couple weeks max & No Rust! You do need to treat the clean surface as when it hits the air again, she just wants to surface rust. I'm about to pull out 4 old Toyota split rims from the 44 gallon drum I set up a fortnight ago. Wash off the smelly good, dry, rust converter spray I already have, thought I'd give it a spray before spray painting them. My car trailer will be on the road to looking good!

@lsuman38 2 года назад

On point!! My mower with 691v Kawasaki had no spark while engine was hot. Replaced coils, still same problem. Cleaned all wiring connections and now no problem.

@duneattack Год назад

Thank you!! Out of 5 or 6 vids I've watched you're the only one to explain what removing the primary coil wire does. It effectively eliminates the key switch (ground switch) from the run circuit My ignition switch fell apart and the clowns at the small engine repair shop told me to just connect the two wires together which effectively grounds the coil and shuts off the spark. My primary issue was not only bad gas, but water in the fuel as well, but in order to get to the carb I had to remove a cover, but in order to get the cover out of the way I had to remove the key switch wires, and in doing so I snapped one of the connectors of the switch. It's not uncommon for me to compound a problem during a repair when I'm in a hurry and not being careful. Anyway thanks again!

@johnmacdonald6220 5 месяцев назад

I had a Craftsman snowblower a few decades ago where the magnet disconnected from the flywheel and attached itself to the opposite. Took me a long time to figure out the problem. I admit I'm not mechanically inclined but just thought I would mention this incident in case someone has a rare occurrence like I did in the early 80's. I appreciate learning from your videos. Well done and clear concise information.

@tannerc900 7 месяцев назад

This was a huge help. I have a old 80s generator with a points system in trying to get going again and I replaced the coil with a new upgraded electrical one off a generator that DID run once upon a time and turns out that coil is now dead as well.. what are the odds but now I know. Huge help, another big thanks to you Don!

@larrydobson6986 2 года назад

I have been trying to figure out what is wrong with my 290D as far as a spark problem. You solved it for me in a couple of minutes! Now I can look for my wiring problem. Thank you for your help! The Old Guy/Larry

@BearE9090 7 месяцев назад

Thanks for the great tip. I put a new coil in my friend's lawnmower, and after a few weaks it started dying again after a few minutes, it wouldn't start till it cooled down. Hopefully I remember this in the spring.

@RollingEasy Год назад

Great advice and yes, 71yrs old and I learned something today.. Thank you.

@istonemind 3 месяца назад

As always, the best source in RU-vid on tractors, i.e., most thorough, but succinct, coverage on the subject involved.

@amandagardner565 2 года назад

great advice Donny. a few years ago my wife had a Murray Ride on mower stop running while we were collecting fallen branches, we had been stating and stopping the mower a dozen times prior i did everything except pull the cut off wire, the fault was a short in the connector to the seat safety switch. there is a spring in the connector that over time shorts out, planned obsolescent as its finest. i've removed that shorting spring from several other Murray mowers since then.

@leonhill6800 7 месяцев назад

Hi, I was having trouble starting my Stihl cut off saw. It was intermittent, as in a very weak spark sometimes, then nothing. However, even when there was nothing, when earthing the plug on the engine, I would have no spark,but, would get a bite on my fingers when pulling it over. So I looked up your video and did the kill switch wire thing and there is definitely a coil problem. now I can purchase a new one and be confident it is the problem with not starting. ( Oh I had cleaned the flywheel magnets and the two pick up poles on the coil which were quite rusty and regapped the coil, when checking it in the first instance, hence eliminating a poor contact scenario). Thank You, for making a comprehensive and easy to understand video

@blatorden 2 года назад

Thank you for the info! :) Update. I just finished repairing my chainsaw. The flywheel was too close to the coil, too much wood dust everywhere, one tube from the rubber pump (the pressure one I guess) was shredded at one end. The light rain here pushed me inside the house. My room smells of gasoline. Tools everywhere. I kept going. The coil and the flywheel were pretty clean. I changed both tubes in the rubber pump area, cleaned the parts, re-positioned the coil (I did that trick with the business card), started the chainsaw, and... it works! The engine coughed a few times while I pressed the acceleration, then it worked better and better. Maybe tomorrow I'll cut some wood. I'm tired but I'm also happy. Thank you, man. 😁

@johnw1178 2 года назад

Don, I was already familiar with this diagnostic but I am sure many will find this informative video very useful. It was well laid out and gets to the point quickly. Even knowing the process I watched the whole thing and enjoyed it 👍👍👍👍👍

@lonniekruse5562 День назад

well done my 15yr old understood everything you said and got it running. thank you. it was the coil

@sonofthe80s Год назад

These are among the best videos on small engine repair and maintenance, thanks for posting

@fhiggenbottom 7 месяцев назад

Thanks for the great video donyboy73! I've watched so many others that leave you with more questions than answers. Yours are well thought out and concise. Yours and Tepco Cycle repair should be the standards for posting helpful tutorials on RU-vid.

@jonreynolds6248 Год назад

This one of the best common sense and best explained small engine vids I've ever come across on here!! I am always saying to my siblings that I am no troubleshooter with small engines, but with this info I think I graduated a couple grades. Thanks again!

@keithrayeski3147 2 года назад

Great step by step diagnostic explanation! I trust this will help a lot of folks!

@michaelt1349 2 года назад

Good job Dony. My lawnmower with a B&S engine of 1994 vintage still has the original coil but I suspect one day I will have a no spark issue. This video is a good place to start the diagnosis.

@mikebetts3573 Год назад

This guy is so outstanding he has just answered the major questions in My Little Life thank you guy thank you

@Benius Год назад

Thanks a bunch, this helped me resolve an issue with intermittent spark. Turned out to be the kill switch cable being worn/stretched out (who would've thought huh?), added a spacer as a quick fix and it runs like a top! 😄

@kennethtalbott2233 Год назад

great info thanks. my engines a brand new 4HP Loncin, ran for less than ten minutes now no spark, checked the plug and that's good, gunno do this test before i send it back.

@ApexHotShot 9 месяцев назад

Thanks, Dony. I have an Echo BP 265l leaf blower with no spark. I will use your tip to isolate the problem. Love your channel.

@frankmchutchison9436 Год назад

thank you for making everything clear and accurate, and a pleasure to watch,

@kalsworld2347 Год назад

This is the best tip I have seen troubleshooting my tiller issue. Was able to figure the issue using this method.

@jerrytaliercio9087 Год назад

I have an echo backpack blower with no spark. I changed the coil and cutoff switch. Cleaned carb and new plug. Still,don’t start. I’ll figure it out but my point is your video is best so far after an exhausting search. 🤙

@simonmorris8651 2 года назад

Doh! I've been using and maintaining my own kit for 17yrs for my garden maintenance business - I know how a coil works BUT never thought of doing this so as to get a quick diagnosis....I'm SO annoyed!!! Thank you Don for another great helpful and informative video. Great camera use too 👍👌👏

@rpavlik1 2 года назад

Great, thanks! The kind of thing I'd hope I could figure out on some level, but it is really useful to have it explicit.

@tomfillmore9710 2 года назад

Thanks buddy great advice and very helpful appreciate you sharing your knowledge take care

@frankmayer7960 Год назад

Un gros merci Donyboy, très instructif, on est chanceux d'avoir des gars comme toi sur youtube. As someone else said, you saved us hundreds if not thousands of dollars over the years. Thank you so much for your work.

@donyboy73 Год назад

merci beaucoup!

@jbplays7302 2 года назад

Great video Donny!!! You probably saved alot of viewers from wasting money on coils, when they really just need a new switch, or wire that's gotten frayed.

@ojong20521 Месяц назад

Thanks Don. Great job explaining ignition coil problems and thanks for sharing your expertise!

@balmeros272 Год назад

100% Brilliant straight forward how to check a coil. Best on youtube by a country mile.

@skipproctor8979 2 года назад

Great Vid! I would never have thought to check non-grounded wire. Thanks Don!

@cim851 5 месяцев назад

Hi Don, thanks for sharing your money saving knowledge. I have a Gravely ProTurn48 with a Kawasaki FX691 engine. Recently became hard to start and then would not start at all. Found a frayed wire running to the tab on one of the coils. Rats/mice had been busy doing some “servicing” as you said in your video. Fixed wire and it fired right up.

@BobHerres 2 года назад

Wow! I really didn't know much of anything about this very mysterious area... As you mentioned once one understands this simple concept trouble shooting spark issues will be quick and easy! *Excellent Bonus Tip about having a solid plan in place to "stop an engine" once you have the switch wire disconnected!... :-) Thank you for sharing!

@scottflower6547 Год назад

Thanks for getting right to the point and adding no fluff

@mweimorts 2 года назад

Thank you for making this video. I am confronting this very issue with a leaf blower. I now know how to diagnose the problem.

@barrybebenek8691 2 года назад

Absolutely fantastic info. Thanks again Don. 🇨🇦👍🏼

@thebradleysoncatbirdhill6849 2 года назад

Excellent explanation of that phenomenon. Very well done, Don! 👍

@kevinhitt719 Год назад

you sure made that easy to understand and so simple to do I have an old kohler engine from the early 60's with no spark now I know where to start thank you

@cathyhale7817 2 года назад

You’re the best! My son and I have learned so much from you!!

@markdederick1953 Год назад

Great vid Donny. Electric problems are my nemesis on equipment I’m working on.

@david-kelipsobaker4090 Год назад

Thanks for your help I'm going to check that now Briggs and Stratton lawn mower

@drkwlsk 2 года назад

Excellent explanation on this topic. Love these videos!!

@ClipperzPM 2 года назад

Thanks for this video. I was gonna buy new coil but i will follow all your professional advice from this videos befofe i walk down to the shop and buy coil

@doviejames Год назад

Thanks, great tip! Helped me get my stepsons Stihl 029 running and he's very happy!!

@davidwee6927 2 года назад

we all enjoy listening to your video. Thank you.

@damienjackson2450 Год назад

Really well made and informative video. Simple and clear information. I don't have this issue and just stumbled across the vid, but am now a subscriber. 👍

@jamdownone 2 года назад

Thanks for this great tip DB ! love your channel.

@Dave-ty2qp 7 месяцев назад

Thank you sir for a very good lesson n troubleshooting no spark preblems on small engines. I am impressed.

@mabisson1 Год назад

Thank you for the perfectly detailed information. I will be sharing your pages to all my friends!!

@ryanbruner8928 2 года назад

Great video for someone trying to do the work themselves! I've found that a business card works great,too!

@dickcreamer6898 Год назад

Tried this for the first time and found the coil to be fine. All wiring and connections were fine. The solution was simple and right in front of me. The generator had run then I changed the oil . I had put 22 oz of oil in it which come to find out wasn’t enough. I added approximately 5-6 more ounces and it ran great. Hadn’t noticed it had the low oil shutoff on the unit. Lesson learned and thanks for all your help Dony

@brianmcconnell7988 22 дня назад

good video dony i had a no spark problem with my stihl blower it was rust on the flywheel great tip !

@theon_ean_donly Год назад

Thanks a million for making it so clear and to the point 👌👍

@billyhighfill 7 месяцев назад

Thank you sir. My toolbox has increased exponentially due to videos like this!!

@ohbrother3792 11 месяцев назад

I will try to remember this. Thank you very much for your insight !

@pgtips9236 Месяц назад

Perfect explanation that i used to diagnose a faulty coil on my lawn mower which is now fully working 😁

@robertwilliams6288 2 года назад

Thanks Don for giving us a place to start checking when there is no spark.

@budgillett9627 2 года назад

AWESOME! Thank you from Nebraska.

@waynedutton7046 Год назад

Great clear instructions, thanks for the help.

@dinkumannely3963 2 года назад

Thats a life saving hack. Yes it's something new i learn now. Cheers for the tip.

@tonym6920 2 года назад

Solid advice Dony, thanks! Have a great weekend.

@lizandromiramontes661 Год назад

donyboy73 nice video , your the only one that I seen said to remove corrosion the magnets. that is a big problem if the lawnmower is left out in the rain. again nice video

@mattb9664 2 года назад

I went through this last year with my 12 year old SRM 230. It was running totally fine the year before, believe it started during my Christmas break maintenance, and I had it stored with 100% pure fuel and oil mix. It burps on first pull, and then starts right up afterward. Last year the thing wouldn't start at all and it was totally dead. I ended up proving that it wasn't the wires or kill switch first, tried a known good spark plug to prove there was still no spark (in some cases very very dim spark), and then ended up justifying the purchase of the $50 OEM ignition coil (without boot). The resistance also was way out of range on the old one, where as the new one had proper in-range resistance. Replaced it and the trimmer started right up.

@mikespain8655 2 года назад

Pull the spark plug boot also with no spark, and check connection integrity.

@enriquegonzales4433 Год назад

Excellent video...Very well and very clear explanation. Good sound and clean English, easy to understand. Thank you...!!

@ChuckD59 2 года назад

Thanks dony, some good info there and well-presented (speaking as someone who, as a young 4-Her did demonstrations at county fairs and won blue ribbons).

@bobplummer3986 9 месяцев назад

Thanks so much, This was the answer to isolating my no spark with 2 new coils issue.

@barrypettit3668 2 года назад

Thanks Don, another great video. Keep them coming, i enjoy everyone.

@brianpooley6635 2 года назад

the lawnmower I had used a metal connector (probably for noise supression) that had gone bad but the wire up to it was good. Not realizing it was not a full unbroken wire to the plug I ended up replacing the coil unnecessarily. I learned that to always check the closest point from the coil for spark.

@tightline6lb Год назад

Nicely done on the explanation of the coil issues. 😊

@barriejones15 Год назад

Very straightforward explanation, many thanks

@kensmith6708 Год назад

Hey Don, great informational video I've been watching alot of your videos I'm new to the utube world. I am a retired machinist and I think you do an excellent job at explaining how to do things. I also noticed you have a motorized airplane hanging from your ceiling I too have a couple planes and rc vehicles of all sizes great for relaxation. Thanks again for your help and sharing your knowledge.

@donyboy73 Год назад

welcome to my channel Ken!

@bandera001 10 месяцев назад

Thanks Don, just fixed my Redmax backpack blower with this advice, coil was bad.

@drewk3402 2 года назад

Excellent video! Thank you, Don.

@chadbeachem956 2 года назад

Professional and informative please keep up the good work!

@joemcardle1155 Год назад

Thanks Don! I think my neighbor was getting tired of fixing my chainsaw, so this time I was on my own. I was pretty sure I had no spark, but didn't know where to go from there. I disconnected the coil from the wiring and it started right up. I probably should have followed your instructions more closely (i.e. remove the plug from the engine, ground, and watch for a spark) since there's no way of shutting the saw off, with the coil isolated from the on-off switch. Reconnecting the coil shut it down, but I imagine it's probably no a good idea to start a chainsaw up with the on-off switch disconnected. Now I just have to figure out how to get to the bad wire.🙂

@glenholmgren1218 3 месяца назад

THANKS! excellent description

@bobmcl2406 2 года назад

Really clearly explained, as always. Thanks Dony!

@ianbutler1983 2 года назад

Thanks Dony. That was very useful information.

@hillwooky Год назад

Thanks. Perfectly simple explanation.

@chucka53 2 года назад

Your explanations are always clear. Good job Don.

@donyboy73 2 года назад

thanks Chuck!

@5Burma 2 месяца назад

Best explanation of how to check an ignition coil for no spark. Thank you

@vetterfellow 2 года назад

Good morning DB73 - You were loud and clear. thank you again for sharing your knowledge without collage 👍 stay safe my friend. See you on the next video 👋 adios.

@donyboy73 2 года назад

thanks buddy, have a great weekend!