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1961 merc 60

C

crappie55

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I have 1961 merc 60 6 hp I completely rebuilt it rings, gaskets, seals , fuel pump everything. Idling or at half throttle runs great. Full throttle will bog and die. Take housing off and it will run with open throttle. Do I dare drop main jet size? It has standard.45 in it now
 
Okay. If that's the case, it should have no effect on jetting. I suspect an ignition coil is failing and it's dropping a cylinder. Best way to find out is to run the HELL out of it as it's screwing up, then shut it RIGHT down--no idling--and plug plugs. The wet, black and sooty one needs work: Either the points need cleaning, the capacitor is shot, or the coil has had it.

Jeff
 
fastjeff said:
Okay. If that's the case, it should have no effect on jetting. I suspect an ignition coil is failing and it's dropping a cylinder. Best way to find out is to run the HELL out of it as it's screwing up, then shut it RIGHT down--no idling--and plug plugs. The wet, black and sooty one needs work: Either the points need cleaning, the capacitor is shot, or the coil has had it.

Jeff
Click to expand...
Can't understand why motor will run wide open with cowling off, but only 1/2 to 2/3 open with cowling on. If coil or points and condenser( both are new) motor should not be able to run full throttle with cowling off. I will try high speed plug check. Thanks any more ideas will be appreciated
 
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