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2002 Mercury 40 hp / 2 stroke / 2 cylinder / one carberator

Howmaster

Member
Motor makes "thunk...thunk....thunk" sound when put into
forward or reverse. Sound dissapears in neutral or reverse and dissappears
if I take the prop off. Otherwise the motor run great. Starts great. ( compression is 124 & 125). Trolls real quiet at 900 rpm's. But "just in gear" at 750 rpm you get the "thinking" noise?????
 
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