Is this muffler OEM? 038av Stihl And is this carbon buildup normal?

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BrownBrown

Brickbrick
Joined
Feb 24, 2019
Messages
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Location
St. Louis
Is this muffler OEM?
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And is this carbon buildup on the piston head normal?
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What is this piece? The one circled is the unknown piece. I have one that goes to the oiler gear but idk where this one came from
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Thanks!
 

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Outboard motor oil possibly? [emoji848]

I think I see a Helicoiled plug hole.
 
Ozhoo - thanks!
I found the stamp on the muffler and yup it’s the trigger throttle pin!

Driver - I think you’re right looks like somebody fixed the threading at some time

Thanks guys! :D

I didn’t put cheap oil in it I swear!
Is this really bad? Do I need to take it all apart and get this fixed?
 
I wouldn't worry about that dirty piston top. Just indicates a poor tune on the carb, cheap mix oil, bad gas, or a combination of these. I'd put good mix in it, tune it proper, and run the snot out of it! I bet once you get it warm it will smoke for a bit under load as it cleans itself out! Nothing to worry about at all!
 
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