My KM-55 RC-E has the same problem. Thanks for posting this video. I replaced the ignition coil and it works great now.

Having problems with my HL 94. Gathering intelligence. This video brings me one step closer to the solution. Thank you for the information.

Great video!!! Thanks for showing the alternative testing method for those who don't own the spark ignition tester---a totally save for me!! Also, I didn't know their is a gap requirement between the magnets,--much appreciated as it surely would have ground down part of the module. Clear and informative instruction for diagnosing my Ryobi RY34000 (x430)---I'm now a subscriber to your channel. ....Kudos

This helped me troubleshoot and fix my KM130. Thanks.

Great Video man. This hit the spot.

When I was a pro motorcyle mechanic, we used to check for spark by sticking a pinky finger in the spark plug boot, ground your index finger on the case, turn on the ignition and crank over the engine. You know right quick if you have spark. That one always impressed the customer.

Thanks for an excellent video sir,take care.

you just saved me all kinds of time, effort and money. I used to own a Mowing company that mowed and trimmed for the state of TX and the U.S. Corp of Engineers. Have worked on many of weed eaters . Retired now and have had a Stihl for about 7 years.. Only problem I have had is the gas filter in the tank, and the muffler screen, also build up in the exhaust port , that is until now, The plug has week fire and a new plug wouldn't fix it. Figured I should just buy a new one as the local guy charges 75 a hour to work on one with one hr min. I tore it apart and figured it was scrap. Thanks again.. I now have a nice running machine once again. apologize for the poor wording , kind of in a hurry. Drurry

Awesome vid , brother!!!! Having same issue with my trimmer. Gonna give that fix a try. Thx!!! Keep it up!!!

Thanks for your informative video. After cleaning the carb and a few other parts I could not figure out why the starter cord wouldn't pull out. After watching your video I realized the ignition coil was too low and had to be raises slightly. Thank You!

Really great video - I learnt a lot Many thanks......all the way from London !

Thankyou for your repair video very clear it helped me repair my machine.

Thanks for video, got my stihl hl 75 running again .Found it was the the the ignition gap.Set it to your advice. Once again thanks.

Great video Pal, having same issue with my br 420 blower👏

Best weedeater ive ever own after 15yrs the coil went bad thanks for the video

Excellent video and explanation!

Most excellent video Bob!!!

Have a homelite trimmer that was running poorly ,had good spark,getting fuel, fuel lines were ok ,good filter tried cleaning carb, same issue.....even adjusted fuel mixture on carb ,same results, went on EBay bought China made carb new $10 ,put it on,runs like new.I did have to fine tune carb .these little engines are pretty simple to work on ,especially if you watch enough u tube videos, they really help.

Well done Bob!!

Great video. Keep up the good work.

Brilliant video thanks buddy

I think this video is very helpful. I also noticed a comment that you did not test the coil and this is because the coil also has an ignition module built inside and cannot be repaired. So if you have no spark you must replace the complete unit so it would be an unnecessary test to do and show. It would be a different situation if the electrics had a separate ignition module or even points and condensor, then you do need to test the coil.Good helpful video with clear and easy instructions on how to replace a dead coil unit.

thank you again . gracias muchas gracias. very helpfully

Cheers HowtoBob :D Nice clear relaxed info mate. I very appreciate it!

My favorite Sthil weed eater, love it ❤️❤️❤️ super nice 👍👍👍👍

Thanks for the video, informative.

Good details on this repair.

gracias exelente video tips !!

great video........well done

WAS A VERY HELPFUL VIDEO, Thx

Very nice video!

Not a bad video at all. Much better than one I saw a while ago where he just stuck it on and didn't think the spacing or much else since it looked like he contaminated the crankcase to get to the coil which in his opinion was easier but after using it again less than 15 minutes after turning off the camera I wouldn't be suprised if the thing failed and was tore up inside lacking compression or seized maybe.

This way looks very professional and systematic. I have no experience in small engines. But I enjoyed your video. I have a question (I don't know, may be its a silly question) How is the resistance of the faulty vs. good ignition coil ? Can we check them using a ohm meter ? Have you ever tried ? Thanks.

thank you for sharing. saludos

I was reading a booklet actually from the company that made his trimmer and a 75 which is similar also that says the spark should be able to jump a 8mm gap during cranking speed if its a good well functioning coil.

concise and precise

great video really helped

Good work 👍👍👍👍👍👌

Response to L Bandara Due to your security settings I could not respond directly to your comment. I am not sure of the resistance of the coil but I'm sure there would be a difference between a new one and one that is no good.

I found a much better way to test the coil. Take a nail and wrap a copper wire around the one end of the nail. Then put the nail in the spark plug cap and give the other end of the wire to a friend who is helping you out but knows nothing about engines. Tell him or her to hold down the engine with their other hand and give the rope a pull. If the friend jumps and starts yelling the coil is good. If not then you know its bad.

How can it start if the stop switch is disconnected? Does the stop switch short to ground to prevent a spark in the cylinder? That would work but it's not "fail safe" and I would think it's designed some other way.

awesome thank you

If use your meter on ohms, go from the arm that goes thru the center of the coil (core)or the arm that goes toward the magnet. Then the other lead goes to the spade connection coming out of coil, you should see no ohms or an open. If you read anything between these two points then the coil is shorted to ground which is the same as having the switch off. Which the switch actually shorts the coil or ignition module to ground.

funbro, thanks for response,,, if I remove switch and connect wires dose this ground or open the coil for ignition ? (jump switch) wired from one coil post to other?

Thanks

Great video. I do have spark to the spark plug. I have taken the carburator off and cleaned thoroughly. Fuel filter appears great. I am not firing at all. But some fuel is misting out of exhaust. Still wondering if the spark is weak and still may be a bad coil??

Thanx

Great video, thanks Bob. My twenty year old Jonsered GR36 brushcutter won't start. Coils for it are no longer available so I wondered whether I could use a coil from a different machine. Any ideas please?

so when I ohm out the switch my readings are 2.777 and 5.2 compared to your 0.0 and infinity.....guess my switch is bad?

Hell bro this is a new trimmer!! Only making Sthil look bad.

I need an ignition coil for a Stihl BG55 blower. I'd like to get an OEM part. Where can I buy it? Can't find the Stihl part number online. Thanks for posting this excellent video!

I have KM90R and iprocess of removing coil I lost one of the spacer washers between coil and engine. The other one appears to be ceramic and wondering if I can replace with a couple metal washers for same thickness or try to find the ceramic ones? It doesn't appear that yours had these? I've searched work area and it just disappeared??? @$%$@ Got new coil installed and still won't start so will do the tests you showed. Also have to remove handle to fix top switch that lost it's spring in the process. Hopefully is an easy fix ! New wire came with coil and may have to switch out wire?

Good video. Could you have electrical specs for tha coil? in order to check the device. Thanks.

Great video thanks !

I have a trimmer that only sparks one single time on each pull, could it be the ignition coil too or another issue? The coil isn't completely dead but just gives a single spark.

Mine is a Husqvarna 322c and it has weak spark, its even hard to see it jump spark plug gap. I actually put a screw driver in the plug boot and held the cylinder and cranked it, i feel a tingle but its not enough to make me jump. maybe this is why when it runs it runs so bad.

Does this affect ignition timing rotating the flywheel, or only if the ignition module is different?

I love it when people don’t talk shit. Thank you great video. Maybe you can teach some of these clowns how to make and informative video that pertains only to the object that their fixing. Thanks again video helped out a lot it was exactly that.

Hi, Fantastic video. If you use an aftermarket coil will that work? Thanks

Got a question When using a meter set it to OMS what is the number that has to read?

Sir, My BG55 Blower needs a new ING Coil also. I bought a new one at Ace and it's A Stahl also! How ever the rear Small wire terminal plug came off the old one and there is not one "wire terminal" on new coil. So my question is does the wire terminal get mounted on the new one and if so how?? Thanks any help anyone can be..

YeSir.u.The.Man. Bob...

you are the MAN THX ALOT VERY HELPFUL. . SUBSCRIBE

how do you actually test the coil? I got spark after removing the ground from the kill switch.

Great video. I have a new KZfaq channel. I hope I can get my videos as professional as yours. Good job

how long b4 your coil failed??? I have an FS80; it's been having issues lately starting; used to always be a one or two crank TOPS startup now it also could be flooding issue too; i saw how to clear out a flooding issue and it takes me about 25-50 cranks and really sukks.... how much is an ignition coil??

I have a fs81 are the coil's the same in both because I think that is the problem on mine thanks.

the ignition gap you said is 12000 , is that means in my ignition gap set measure 012 inch ? would you please tell me ? thank you for sharing. saludos

Can anybody help? I've got a mountfield model 23 brush cutter that had no coil, I found a replacement coil ... but I've got no clue where the positive and negative cables from the hand controls go, or where the black cable from behind the fly wheel connects to ... It would be nice to get her hooked up so I can whack some weeds! Thanks to anybody that can give me some advice. 😁

Can less ignition coil cause back fire

My Stihl mechanic said my timing might have slipped and altered timing. What did he mean? My understanding is that the coil is preset and cannot be altered. Was he talking about the magnets position on the crankshaft?

I have a FS80 and can not get it to fire,, if you connect the wires at the coil that goes to switch(if switch is bad)they will be direct from one post of coil to the other,, will this cause a ground or will it by pass the bad switch? I've done every thing, jumped switch as stated, replaced coil, still no fire ???? any suggestions ?

hava a question if you can answer i will presiate i have an echo weed eater works good for like 10 minutes when gets hot it bog down i replace the carburator line fluid and spark plug an it still doing the same did you now what it is

I'm missing the upper screw on my SF74 trimmer ignition coil. Can I use a generic screw here, can I buy a single replacement screw, or do I have to buy a whole new coil? The coil seems to be working, but due to the missing screw it has shifted position, so all I need is the screw.

I never saw you TEST the COIL with a meter

why does it spark across a tester and not a plug?

There is continuity when switch is stop(off) position and no continuity at on position. Is my weedwacker good, bad or reversed polarities.

Good day can you tell me where I will get an ignition module

i got a Honda gx35 4 stroke grass trimmer and every time i start it @ first 5 mins it runs ok... but when it starts to warm up it begins sound like its been choke or something....runs sluggish ..tried to rev it and it dies immediately.. test the ignition coil.. and it tells infinite numbers which worries me ... is that mean i have a faulty ignition coil?

Ok bob what ohms did you set the meter to please

Whaz ignition system does this trimmer use

Seems alot of 2 stroke engine coils go bad internally. Anyone know why? I bought a small King generator--one 10 minute use and no spark. $40 dollars USA is alot for a machine that is worth $100 dollars new. By the way--rust build up between the coil forks and the magnets could be a problem. However great presentation and professional done. Thanks :^)

Not scrutiny brother but first before all is to check the idle screw, play with it, also check the choke some engines like richer, rich and lean “more fuel on initial combustion. Check spark plug and switch, then,,,, magneto. Also? Does it have old gas in it?or is it two stroke and oil/ gas mixture correct? Is there water in the gas tank from sitting for awhile, due to condensation?

Question, I have an old FS-85 (20+) My "off switch" does not have the blue wire, just the black wire. I pulled the spark plug and tested it, I am getting a spark. I rebuild the carburetor but the engine will not start. There is fuel on the spark plug. I am totally stumped. I was a marine mechanic at one time. I know these engines are not complicated. Could the coil be intermittent? I have checked the throttle linkage, coil, and carburetor even ordered a new carburetor. Still no joy.

hi...i have the same weed eater. it only runs for about 30m and then shuts off and it wont not start again untill is cold..i already change the coil, the spark plug, tha carb. any ideas?

there are 3 wires on mine, what ones do i put it on

Anyone know why I'm loosing fuel prime after 30 minutes of use. I can see the fuel return back but cannot keep primer bulb full.

Replaced the module last season on mine. This spring I got a couple pops out of it, and no spark. Couldn't believe it. Anybody else seeing this? Another module was the fix.

I have a fs85 weed eater that won't start, I already changed the carburetor, help please

maybe could have checked the gap of the old coil first? and is there supposed to be continuity on the old coil's terminals at all or not?

Trimmer produces smoke what to do

My weed trimming is about 7 months old and not starting

I'm not got the answer for fix my still ms 192 tc triger

My weed eater runs hot and bogs down when I hit the grass any Ideas

I already changed the ignition coil but still it wont start

Why theses coils went bad so quick and often.

I got a very weak spark must replace coil

Worse if your engine sort of runs ok but shuts down after 10-20 mins hot and fuel system is ok?? Drove me crazy till i realized the coil was de- laminating and shorting when HOT! I guess to test you could put a hair dryer on the coil and watch the resistance go down a bit? and then suddenly short out!!

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How the hell is your 80r so clean?