1985 DT75 Suzuki runs real rough at low RPMs/Idle & in gear. #2 cylinder low

TimDollar

Cadet
Joined
Feb 7, 2006
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1985 DT75 Suzuki motor runs real rough at low RPMs/Idle & in gear. It is so rough it shakes the boat. The higher the RPM the smother it runs. I just bought the boat so not sure how much it had been used. I checked the compression. #1 and 3 tested 150 PSI and #2 holds only 90 psi. It starts easy and stays running with no problems. It does push the 1972 16' Del Magic boat up to 40 MPH at over 5000 rpms. I am thinking of removing the head to look at the #2 piston/cylinder and replacing the gaskets. Any suggestions?
 
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