Fixing A Lawn Tractor That Pops & Backfires!
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- เผยแพร่เมื่อ 30 ก.ย. 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.
Watch my video review on spark tester used in video here;
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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 TH-cam and the entire internet with over 1200 videos, just GOOGLE "DONYBOY73"!
I want "DON THE SMALL ENGINE DOCTOR" on TH-cam 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 - แนวปฏิบัติและการใช้ชีวิต
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
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
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
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.
Thank you so much for your help with this matter. I'm confident in my ability to replace the ignition modules.excellant video.
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?
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!
This is a very helpful video. It was clear, concise, and not overly long. The camera views are excellent. Good job.
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 keep referring to the "positive wire" on the coil. Isn't that a ground wire? I'm not trying to be snarky, I am trying to learn small engine repair.
Ken when you turn the ignition switch off that wire essentially is grounded. There will be no positive voltage on those two wires, or at least there shouldn’t be unless you have further issues. Kohler does make a 2 wire and 3 wire coil setup on some of their older command series that’s referred to as a SAM module meaning Speed Advancement Module. It advances and retards the ignition timing depending on engine rpm and load and there is a ground wire, 12v positive, and a signal wire on those coils.
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.
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 !! 😎
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
Good Coil diags. Sometimes a twin cyl with one bad coil can mislead you to believe you have a carb issue.
Never listen to customer diagnostic... especially if they say the word "carburetor".
Thanks for the help I changed mine out and it now run great
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?
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.
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!!
Very informative vid, thanks Dony. Your camera work is always superb.
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!
Good video but that is a negative ground wire not a positive wire.
If the customers don't believe you, they can watch your videos! :D
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
Again... just what I needed to know! Thanks Don! This is the best on the Net!
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?
Hey Don, always learning a lot from you. Great videos.
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
My troy-bilt pony will pop and BF WHEN I put the blades active mowing ,then uphill it stalls. Please help. I just got ripped off from fb classifieds. I just don't wanna lose so I'm on a mission to fix it...thanks
Thanks for the gumball Mickey 👍
YOU’re the GREATEST. LOVE ABSOLUTELY LOVE YOUR VIDEOS!!!!! Thanks DONYBOY73
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
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
Hello, so my problem is that my lawnmower turns over but doesn't start. I changed the fuel filter and hoses, also checked the spark plug, put new gas in it, and added a lil oil and no I haven't checked the battery to see if it's fully charged yet but I will. Any advice please, you have a lot of good tips unfortunately I'm not mechanically inclined especially if I don't have a book on my riding lawnmower. Please can you help meeeee, Kay
When you are turning it over does it try to start at all?
At this point I have 3 suggestions. First maybe a plugged jet in the carberator, or the float is stuck open. Oem new is about 80 Dollars US. EBay has sufficient aftermarket carburetor for any where from about 12 on up. I usually get the money 20 to 30 dollar replacements. 2nd would be the coil. 3rd would be the safety shut off switch on the bottom of the seat. Those do go out occasionally. Plenty of videos on repair or replacement.
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.
PLEASE HELP ANYBODY PLEASE!
My lawnmower won't run. It's a $400 mower and my neighbors are spiteful. They are going to report me. I've replaced the carburetor, the coil, the sparkplug, the filter, and it won't start. It only backfires. A guy I know supposedly fixed it. He said "water in the gas tank". Gave it back, and it's worse. Backfires when trying to crank. I'm full of anxiety. Please help.
@donyboy73 I need help with my 14.5 Briggs it's a mtd yard machine. I've tried a baught 3 different parts and it still doesn't turn over. I can hear the solinoid on carb click but nothing else. Really would appreciate your advice of what might be wrong
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?
@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!
Did you misspeak? Or am I wrong. I thought the wires going to the coils are grounds to kill the spark
coming out it is a positive wire that gets grounded through switch to shut off engine
Basically a switched controlled ground wire. They call it ground controlled in automotive.
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.
If those wires are positive then unplug them, then start the mower, it’ll run just fine, then if you still think they’re positive wires, run a 12V lead from the battery and hook it to the coils, see how well they work afterwards
@@donyboy73 actually it's a switched ground wire. The magnet flying by the coil produces the electricity to the spark plugs. When the coil is grounded as when switched (off) it feeds (shorts the coil to ground) grounding the coil, preventing it from producing electricity to the spark plug ('s).
I have the same surging and popping problems. No backfire.. I have the coils in the mail to me with feeler gauge but I wanted to post my experience as a WARNING to all
It was taking the top fan guard off my Deere X320 and the three screws were really hard to move. I found a torxs bit and removed 2 screws but then the bit fell out of my screwdriver and into the engine area. I could not see it. Job stopped. I had the ‘genius’ idea to start the engine so the vibration would roll the missing bit out onto the floor. The guard (10inches and round) was held by one screw.
WELL the screw held but the centrifugal force spun the guard and ripped the guard to shreds and it flew
It smashed the air cleaner cover, then ripped the choke cable out , then hit the battery and made a big hole in it so acid came out onto the concrete and made a choking gas, then it continued and hit my groin area and made a hole in my jeans and missed my crown jewels by two inches.
It’s a large graze but superficial. No blood. I have bought a new guard for $30 and bought a used plastic air cleaner cover on ebay…and a new battery
I have bought 3 new screws at 6mm with Philips heads this time. I used an adapter on my socket set with a big Phillips bit to get em in HARD. Coils expected in 7 days
I took the cable control levers to pieces…complex but I figured it. Carb end : TH-cam said the top hole is the choke wire, but there are 3 holes and it is the top hidden one .The throttle hole is lower than that and is the middle one of the three.
Ok rebuilt it all and it started first time but he popping is still there. I am very hopeful the coils will fix it…
Yes I swapped out the spark plugs and air filter for fun….
Phew I could have been blinded or killed….. CAREFUL with the hood off guys ! ps when I take the guard off to get in for the new coils, I will replace the screws using blue thread sealer..
I got a hydrocut 32inch ferris. It runs horrible pops and misfires like crazy. My mc20 walker was running horrible aswell. I took the carb off both machines and cleaned them really good. Ive had no luck. Changed the plugs airfilter gas filter. Im so frusterated. Its like the machines are running on one cylinder.
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
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!
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.
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!
Question.. how does a positive wire kill spark?
Those are negative, ground wires! Very informative video though!
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.
How and where can I find lawn tractor parts. I purchased an old lawn tractor and unfortunately I don't know the model number just that it's an old bolens lawn tractor. Anyway I can't find any place to find parts. I've owned it for a few years and it's always ran great until recently I'm having some issues. I am having this issues also and replacing plugs didn't help but I'm also now having an issue of it popping out of 4th gear and making a loud noise in 3rd so I will need to take the transmission apart and replace any worn parts which I'm good at this stuff just don't know names of gear parts or model number lol. Unfortunately stamp is unreadable.
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
Very nice video, thanks for explaining how parts work.
Another very well done and informative video. Thanks. One question, did you check the gap on the bad coil before you removed it?
yes
That's confusing, if the wire is a positive wire , wouldn't it kill the battery with the key off? I left my wires off on a v twin Briggs and the fuel shut off kills the engine. Takes a little longer to kill the engine but works fine.
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
Thanks for another great video! I appreciate you sharing
It’s a Troy Bilt what did they expect. Their products are total garbage. Very surprised that the engine is a Kohler. My Toro has a Kohler and it’s an awesome engine.
i have the same motor my problem is when you want to move forward i engage the blades to cut the lawnmore it stalls the mower why?im thinking it could be one of the belts no trouble at srart up or driving onlly when engaging the belt driveit stalls the motor evetytime ,iy dies after awile maybe bearings or maybe saftey switch. when clutch after the start to cut two seconds later it stalls either the belt stalling .....dont know 19.5kroller motor??????
Great information as usual Don. I feel like your apprentice. Greeting from Australia. Bloody heat wave here.
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 :-(
Um..... he was adamant it was a dirty carb. But didn’t have the nouse to clean it himself? Hmmmm sounds like chargeable time.
Edit
The one dislike is your idiot customer
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.
My 12 hp clicks but won’t start I’ve reset the valves but it’s doing the same thing just hate to turn over
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??
Another good one DONYBOY. Will definitely get one of those spark testers. 👍👍
This shit right here would drive your average home repair guy nuts.
You can make a spark tester with an old plug wire from a car. Cut about 3 inches off each end and join ogether with a piece of clear tubing . Leave about a 1/4 inch gap
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.
Those tester's are time saver's
Hi there can plz help me ? I have a rototiller don't start everytime i try only make explosions from the exhaust any help plz?
Ours does not stay idle, backfires and chokes a lot so hopefully this will fix it
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.
"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 TH-cam. Thank you.
that wire that you are calling positive lead is the gd wire that stops the eng with the witch off unlees i miss uder stood you check it for a gd with the switch off ------switch on gd is gone that stops the spark
Hey Dony , I have taken ownership an MTD ride on mower with a 4P90JUA engine in it.
The previous owner over filled with oil... they heard a slight bang and smoke...
I have removed the spark plug, turned the engine over to get rid of any oil in the cylinder... cleaned up the spark plug, made sure it sparked...
When turning the engine over, there is smoke puffing out the air filter, and fuel spraying out...
What seems to be the problem here??
TIA
Jess
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?
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.
Just curious why you run the engine to low power after you start it? Is that for the noise levels or?
always great Dony, thank you ...
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
These are famous for bad coil
Should have been a recall on them 😢
I have a Briggs & stratton 10HP engine on a Snapper 28" mower, my mower will not start with that positive (stop, ground) wire connected to the coil. It will start, run long time then I have to connect the wire to kill the engine. The engine will die with the key in the on position. Also the engine runs very well for an hour or more, then if the engine is shut off, it will not immediately restart, have to wait a few hours till it is cold.
Would this apply to single cylinders as well
What would make a Briggs and Stratton V Twin 24hp run good at low speed but back fire at high speed?
I have a 7hp water pump engine it will not start only back fire's - it's got clean fuel i cleaned the carby put a new spark plug in -it started for a moment and now the bastard will not start just backfires ---any idea what might be the issue?? ( it's a new motor )
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.
what about scotch briting the flywheel? i have to do that on my saw every once in a while. 🤷♂️
I thought the white wire was a ground wire to kill the spark?
What would cause a backfire when trying to start with choke? Can start without choke and no backfire and runs fine, only backfires when trying to start with choke.
I have a Toro self pace lawnmower with electric start. Less than 20 hours use since new last summer. Difficult to start after running for say 20 minutes. Dealer says nothing wrong with the mower however should not be difficult to start at any time. When cold fires right up.
Good day sir,I would like to purchase a couple testers from you,how do I go about doing so?
Thanks
Hi Rick, unfortunately I do not have access to them anymore.
im 70 ,,been working on mowers most of my adult life ..i always thought either a coil is good or bad no in between ,, took many years for me to see different ,, now another story ,i have a almost new 17.5 out on the bench...it was on a mower for one season but not used a lot .. it will run til it gets warm to hot and just quit ,wait a few minutes fires up and runs a few minutes ,,i bought a either 60 or 80 dollar coil and put on it ,,,does the same thing ,,ive had that carb off at least 3 times ,,cleaned it what little it needed cleaned ...i can not get that engine to run for more than 15 minutes ... like i said its been sitting on my shelf for over a year now ...i checked everything i know to check never ever gave up on one before but this one whooped me..
Donyboy73 and Chris Fix are clear and excellent videos try them and see for yourself
I just put new coils on a kohler comand pro 27 but they gave me new upgrades now my engine back fires and it like a flame coming out the exhaust
Price & how to order in line Spark Tester?
Mine lawn tractor does back fire when I down throttle. Would this fix that??
you could check if valve adjustment is correct but some engines do it anyway
How many years or hours do you need to replace the coils?
Positive wire on the coil? Not on a mag coil it is a kill wire. Ok you explained it later. But I would call it a kill wire that way someone don't put 12 volts to it.
Yes the venerable Kohler. Love their new horrid designs where the coils fail, and choke has become a 70 part system.
Why does it back fire when you turn it off
So did you charge for the carb clean also?
Why was the second one installed upside down?