Chainsaw Repair

Update.....ok I tried to run the saw before with an attempt at cleaning the original piston. ...saw cut well but would not idle after WOT...so tried a gasket kit in the carb....same thing so my assumption (a!# of you and me) was a new piston. ..thanks chainsawr fast & perfect as always. So new piston/ring and same thing.WTF ..During all of this I stole another well used 5105 but mechanically great...so got it and it runs perfect so a quick carb swap and ....wammo! The saw I had been working on runs perfect....so had anyone had trouble with these zama c1q dm14's? The good one I have has 01a under dm14 & the bad has 94a. .... any thoughts?  The single wep seal is not leaking .... and while I'm here..The used 5105 went through about 2 1/2hrs of semi dry hedge cutting after being converted to 3/8 050 20" bar and WOW! Great saw. Was working to bury the 20 but didn't quit....As fast as the not working hard 6400 I have with same 20" chain