I have a pretty decent 394 that I picked up along with some Stihl parts. Pretty wnice piston. But no spark! I purchased a DZE coil from wolf creek as their stuff always seems pretty good. But no luck. I’ve gapped the coil with a business card, new spark plug, disconnected kill switch wire at the coil but nothing shows on my in line spark tester. Not sure what else to do except find a dumpster (not!)
Husqvarna 394 I’m stuck!!
- Thread starter david newbie
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Test the tester, then look at the plug while grounded on the cyl in a dark area, if still no spark then
the new coil is bad, or maybe even the flywheel.
How would I evaluate whether the flywheel is bad ?
Borrow one !
Makes me wonder if there’s a detention center for flywheels gone bad
Grab the plug n pull it. Go on 
Reminds me of when I used to make toast in the bathtubGrab the plug n pull it. Go on
My old man got me checking for spark as a kid 
. He's gone now but still chuckle evertime I get myself every once in a while
. He's gone now but still chuckle evertime I get myself every once in a while
That's how e sometimes check horse pen hot wires. Just dont do it with two hands and bare feet!My old man got me checking for spark as a kid
Had a bad flywheel on a MS660 once. Just stick metal to the magnets and if it does not seem strong that might be a problem.
Hey David, I'll trade you a nice running XL12 for that piece a junk!
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This would be the 394 you asked if the HT could be removed from the coil on someone elses post?
Have you dicked about with the HT cable?
Could detach that and test the coil for spark with your tester thingy- then if it sparks but it doesnt through the lead to the sparkplug- then the HT cable is broken- or bad connection at the plug.
Or the flywheel magnets are weak/lost polarity.
Or the coil is bad- so was the cheap replacement.
Or you are still earthed to ground.
Or you used a really fat business card.
Have you dicked about with the HT cable?
Could detach that and test the coil for spark with your tester thingy- then if it sparks but it doesnt through the lead to the sparkplug- then the HT cable is broken- or bad connection at the plug.
Or the flywheel magnets are weak/lost polarity.
Or the coil is bad- so was the cheap replacement.
Or you are still earthed to ground.
Or you used a really fat business card.
Well I'll beeee... I think it must have been the flywheel! I just so happened to have a 394 parts saw laying around, so I put the new wolf creek coil on and had spark! So I traded flywheels ( not very easy, I had to bang and bang on the nuts, wd40 and heat and a small amount of prying, I need a puller ). Put some gas in the carb and eventually it fired. Nest job is the carb. I tried to compare the flywheels and the bad one had just slightly less magnetic pull
