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Author Topic: Husqvarna 385xp Backfire through carb  (Read 514 times)

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Offline brentphilion

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Husqvarna 385xp Backfire through carb
« on: December 11, 2020, 01:58:53 pm »
this is a new one for me  Im working on a new to me saw that was nearly starting and as I dig into it its actually backfiring and sending a puff backwards through the carb.

When I try and start the saw the mouth after the air filter gets soaked in fuel before backfiring.

I'm looking to figure out what would make a 2 stroke backfire?   How does on adjust or correct the timing of a 2 stroke saw?  I have spark and fuel but timing should be fixed shouldnt it?

THanks in advance

Brent
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Offline Cut4fun .

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Re: Husqvarna 385xp Backfire through carb
« Reply #1 on: December 12, 2020, 04:08:06 pm »
WAG. Spitting out back of carb seems like worn intake skirt.

I just fixed a 440 back firing. I was thinking timing. Before pulling flywheel to check.  I loosed coil, cleaned everything around the area. Regapped the coil. All was good then. 

Try simple things first.

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Offline brentphilion

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Re: Husqvarna 385xp Backfire through carb
« Reply #2 on: March 10, 2021, 10:34:52 pm »
Started with the simple things

ignition sparkplug gas carb rebuild cab adjustment

Finally couldnt get the exhaust off to take a look in the cylinder and pulled the jug and found this.  Troubleshooting complete, Time for a new cylinder.

Now for figuring out if i sould use the more common 55mm cylinder and effectively make my saw into a 390 instead of 385xp? and what brand to source
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Offline Cut4fun .

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Re: Husqvarna 385xp Backfire through carb
« Reply #3 on: March 11, 2021, 07:13:32 am »
Thats what I always take a peek inside first things now.

I had a Partner 5000 fooling me.  Had a stuck ring where you couldnt see with a score streak off to side. Couldnt see it from front or rear.

Stock for stock. I like the 385 better. The 390 1mm bigger is a after thought.  Seems more peaky IMO from ones I worked on and test cut here with.  But whatever is in budget can help that decision. 
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