Stihl Ignition Coil Bench Test and Replacement
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- Опубліковано 15 вер 2024
- I bench tested, set the air gap, and re-installed the ignition coil on a hs45 hedge trimmer.
The test I performed was for secondary coil resistance between the laminates and the spark plug connector. According to various mechanic forums, the resistance should be between 2,200 to 3000 OHMs. Mine was 2,700. You could also test for primary resistance between the laminates and the "little lug" sticking out of the coil, as some mechanics say. Primary resistance should be somewhere between 175 to 250 OHMs, but I cannot verify that number because I do not have the Stihl repair manual.
I set the air gap with thick gauge paper, a book mark. Hardcore do-it-yourselfers and mechanics will want to use a specialty tool made by Stihl, built especially for setting the air gap. See the link below:
www.ebay.com/i...
The product arrived undamaged and in a great looking box all parts of the kit were present ua-cam.com/users/postUgkx010hhy8hzepHnne4VtzOtUictDZeYMTF and I can't wait to use it. I'm most impressed by the fact that it's a five piece kit, of great monetary value in that you can get this all for such a price. With this my former grip strength will come back and then some. I'm already starting notice a bit of a difference after using it for a bit now, and the stress ball and doughnut shaped grip designed to be carried in the pocket have helped in reducing my stress levels as of late. Would definitely recommend!
What are the other terminals for? How do you check the primary circuit? Why did you remove the mag to check the secondary circuit? So many questions...
Thx for the video,greets from Belgium!
A very technical video . Can I take it that removing the spark plug and earthing it to engine block is not a great way to test the ignition coil . I have a Stihl sh 86 that has a spark at plug and only fires a short moment . The coil is only 12 months old .
I would be interested in your thoughts .
NICE JOB MATE !!
You don't check the primary coil resistance
Not enough info on setting, and video wad not clear on settings when tring to see what the metor was on.
I've never seen a saw that clean.
WHAT IS THE AIR GAP ?
The gap between the flywheel and the coil legs (not the proper name im sure), use a business card or feeler guage of 13 thousandths.
Thanks dude good video to me as only needed to sharpen up on electrics.Damn local dealer lazy as hell, selling wrong shit constant(new owners).Didn't pay attention,sold me bar wrench for for husky(one only) for $23.Thinking about & stating outrageous price slipped past.Have a few somewhere but needed it now.Peace
Thank you for posting this helpful video sir👍
Great vid 👍
you did not give the air gap??? looks like you were using a thick piece of paper??? .ooo???
We called it a feeler gauge
0.010 inch air gap use brass shim.
Do you need to disconnect the coil to check the impedance?
No, pull the coil wire and meter between plug wire and coil laminated pick up. Remove the shut down wires and check again. The reading shouldn’t change. A short to ground shutdown switch can look like a bad coil.
Hello
I have a chainsaw homelite 340, its coil ignition burns, I have not found on the market a replacement for the same model, can I use another model of a
other brand?
thanks for your vide
If if fits try it only try to salvage for ridiculous pricing.
How did you determine air gap?
Ive done this befote on a mower, but i just used a credit card...
Lol
Use a business card, credit card is probably too thick
0.50 with feeler gauge
Brendon Murray I think you mean .005
On lawn mowers I have used a matchbook cover, it is about 0.020 inch.
Brendon Murray Is that not a little close? I usually go 10 thousandths.
Hi, Have checked the coil and have a good spark, but it still will not fire up, could you give me some reason as this will not go Thanks John.
If you have spark then it's a fuel problem.
Rob Yokom As someone mentioned, there is a primary coil test too not just secondary.
Check from the laminated plates to the small wire terminal. If checks good, probably a fuel or compression problem.
@@rickeykeeton71 And good is? I've read from 1.8 ohms to 3, my stihl coil read 4.7and still works
I think you forgot to test between the spade terminal and ground. There should be a lower resistance. That’s where mine failed
Yes, check manufacturers spec, usually 1.8-3 is ok
Did not give the setting of air gap on coil just a damn piece of paper which no one knows the thickness off.
What about the primary resistance?
Shit !!! I thought you nwere going to test a bad coil, not a good one.
C'mon air gap = thick paper??!! How about a real number?
0.012
Back in the days of Muscle cars most air gaps on points & this style coil was usually just set using a match book or business card. Many points even had notes on back saying use the box/package to set air gap.
Most mechs used a card because it worked.
Cards easier than using a feeler gauge in many cases because they flex better.
Between 8-12k is the actual setting on these small Stihl units.
Check the thickness of an average business card or match book you'll see why they always used them.
My bil owned a full service shell station over 30yrs back then & they all carried a small card in their front shirt pocket for that reason. It was very common...Its not rocket science after all & why it can be set at 8k, 9k,10,11k,12k or just there abouts & run perfectly fine. That's a big span if you think about it.
In fact the OEM Stihl coil I just removed was set at 1k maybe 2k at the most straight from the factory. Idk how it's coil lasted 23yrs set that way but it did.
Not my trimmer so idk how hard it was to start but it had to effect it neg some how? Stihl wasn't even close to spec & I know it's never been apart before today, he bought it brand new. Peace
Afraid you're gonna get your hands dirty on that squeaky clean brand new hedge trimmer? Where's your hearing protection. You're going to go deaf, but you'll have girly soft hands.