My M20 did that on startup when I first bought it last year.
I think it was my carb because I was getting gas in the crankcase so I cleaned and rebuilt the carb and since then it hasn't happened.
I also noticed my high speed needle had a 'false bottom', meaning it got hard to turn and I think the PO had it set too rich, it had an extra turn or 2 in it before it actually bottomed.
Maybe valves also? others will chime in I'm sure.
Goodluck.
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- Tim
1872 60" Haban deck- 2082 450 blower, 50c deck - 1450,1650 2x44a deck, QA-42A snowthrower, 70 w/k181(destroyed) 38" pin on deck
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