Husqvarna 385xp mystery backfire

[Gord404]

a nice burst of flame and a backfire, pulled the flywheel and it had a sheared key, put a good one on its place and ran great- I have built and fixed hundreds of saws including 385 and 390,s so I have lots of parts and if it is your timing will be off causing it to fire at the wrong time or not at all- just trying to help-up to you what you do

 

[david newbie]

a nice burst of flame and a backfire, pulled the flywheel and it had a sheared key, put a good one on its place and ran great- I have built and fixed hundreds of saws including 385 and 390,s so I have lots of parts and if it is your timing will be off causing it to fire at the wrong time or not at all- just trying to help-up to you what you do

I will pull the flywheel and see if it sheared. Thanks

 

[J D]

If swapping the coil fixed it then that would've been it (Gord may have missed that post)

 

[david newbie]

If swapping the coil fixed it then that would've been it (Gord may have missed that post)

Can’t quite say that it fixes it. It changed it. I will fire and run, but quite slowly. So,arb I still have some figuring to do. In the meantime, u will also rebuild the carb

 

[Gord404]

Low speed needle should be about 1- 1 &1/2 and so should the high for starters and tune from there and if it doesn't run any better then time for a carb rebuild

 

[david newbie]

well, finally got around to pulling the flywheel,, key was sheared. Lined it up as close as I could and tightened it down really well. Now it will fire up somewhat close to normal. Still not sure if everything is correct, will rebuild the carb nest and see how it runs

 

[J D]

Sounds like the perfect opportunity to give it a couple of deg advance

 

[Gord404]

Good glad you found the major problem