Hi, I need your help onthis cause I'm out of option now.
Bought this BostonWhaler 2002 with a Mercury 40 hp 2002 2 cylinder 2 stroke, 1 carb, no oilinjection. motor has less than 200 hours. It looks new. no heatproblem from what I can see with original paint on motor. When I got it,it had a problem with the stator. Changed the stator, trigger, and 2CDM. Check all ground and connectors. New plugs. Rebuild thecarb with new gasket. rebuild the fuel pump with new kit. Adjustedtiming a 8 BTDC. adjusted idle mixture screw. Compression is 150 onboth cylinder. Spark is 7/16 on each coil. Nice output fromthe water pump. check the reed valve and they are like new.
My problem: the idle isreally rough. If I removed the spark plug wire from the upper cylinder =almost no change but the spark is good, still has 7/16 on the sparktester. remove the spark plug wire from the lower cylinder and themotor will stop quickly. I checked the trigger of each coil withopposite mark on my flywheel. no miss, no crossfire, very steadyflash on each cylinder. switch the coil = no change problem on samecylinder. Change spark plug = no change problem on same cylinder. Reversed the stator CDM charging coil wire (white and green) = nochange, problem on same cylinder. (This is described on CDI website fortroubleshooting the stator)
So if it is not aignition problem, it has to be fuel ? If I check the spark plug, they areboth wet with mixture of fuel and oil. I checked the crankshaft upperseal and no leak there.
any suggestion ?
Bought this BostonWhaler 2002 with a Mercury 40 hp 2002 2 cylinder 2 stroke, 1 carb, no oilinjection. motor has less than 200 hours. It looks new. no heatproblem from what I can see with original paint on motor. When I got it,it had a problem with the stator. Changed the stator, trigger, and 2CDM. Check all ground and connectors. New plugs. Rebuild thecarb with new gasket. rebuild the fuel pump with new kit. Adjustedtiming a 8 BTDC. adjusted idle mixture screw. Compression is 150 onboth cylinder. Spark is 7/16 on each coil. Nice output fromthe water pump. check the reed valve and they are like new.
My problem: the idle isreally rough. If I removed the spark plug wire from the upper cylinder =almost no change but the spark is good, still has 7/16 on the sparktester. remove the spark plug wire from the lower cylinder and themotor will stop quickly. I checked the trigger of each coil withopposite mark on my flywheel. no miss, no crossfire, very steadyflash on each cylinder. switch the coil = no change problem on samecylinder. Change spark plug = no change problem on same cylinder. Reversed the stator CDM charging coil wire (white and green) = nochange, problem on same cylinder. (This is described on CDI website fortroubleshooting the stator)
So if it is not aignition problem, it has to be fuel ? If I check the spark plug, they areboth wet with mixture of fuel and oil. I checked the crankshaft upperseal and no leak there.
any suggestion ?
