Tec, AV520 on a digger

PTmowerMech

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Ordered a new carb for it (amazon ugh), with new plug it fires and runs pretty good. Just have a couple of questions.

This model doesn't come with an air filter. Just a baffle turned open side down. Would it be OK to turn the open side up and put a piece of pre filter type foam down in it? Cut just big enough to fit a little snug? And then adjust carb accordingly?

Also, I ran into something like this one a trimmer once, where the carb was adjusted good. But the head kept spinning. Even with the idle screw out to the point it's irrelevant, the digger still turns. I'm thinking this is a stuck clutch? Or do they all just do that?
I remember when me and my dad first got into the fence business, we'd rent a digger like this, and the digger part always turned. At idle, it would turn slow. But would still turn. Even with pressure on it.

P.S. I also got a rebuild kit coming, just incase this carb didn't work out.

UPDATE: There was a spring broken on the clutch.
ClutchSpring.jpg
 
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