I have a 1994 2+2 100 hp mercury outboard.
Took the boat out - ran fine for an hour or longer on the way in engine started running really rough at low rpms below 1200rpms
Engine runs fine at higher RPMS - Idle is misfiring at low RPMS, #1 cylinder plug is carboned up others are even and wet. Cleaned carb and replaced all inlet needles, new gaskets. Carbs looked clean and not defects to needles.
#1 and #2 cylinders run perfect while only running one cylinder at a time - when both cylinder are running together there's a misfire.
Next step is to check timing. Anyone have any thought on this?. Have not checked compression but engine preforms great and runs great at high RPMS
Took the boat out - ran fine for an hour or longer on the way in engine started running really rough at low rpms below 1200rpms
Engine runs fine at higher RPMS - Idle is misfiring at low RPMS, #1 cylinder plug is carboned up others are even and wet. Cleaned carb and replaced all inlet needles, new gaskets. Carbs looked clean and not defects to needles.
#1 and #2 cylinders run perfect while only running one cylinder at a time - when both cylinder are running together there's a misfire.
Next step is to check timing. Anyone have any thought on this?. Have not checked compression but engine preforms great and runs great at high RPMS