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99 Johnson J40Jpleec

N

Nicksjet

New member
Lost spark on bottom cylinder, changed plugs, replaced all 3 coils, replaced power pack, still a miss on bottom cylinder and barely enough power to put on trailer. Any suggestions?
 
Does spark jump a gap of at least 3/8" on each lead?-----Carburetor orifice plugs confirmed clean ?----That item is found in the bottom of the float bowl.---Reed valves checked?----Checked if cylinder sleeve rotated.----Rare but it does happen.
 
Nicksjet said:
All 3 between 135-140 psi
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Not sure how
racerone said:
Does spark jump a gap of at least 3/8" on each lead?-----Carburetor orifice plugs confirmed clean ?----That item is found in the bottom of the float bowl.---Reed valves checked?----Checked if cylinder sleeve rotated.----Rare but it does happen.
Click to expand...
not sure how to check cyl sleeve, but when I removed bottom plug, drenched w raw fuel. Will start, idle very rough, stalls. I removed wire from bottom cyl., no difference at all, replaced wire, no difference
 
racerone said:
Use google to learn about this elusive concept of crankcase compression.
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After reading about CC compression I have to assume it’s ok as it will start & run on 2 cylinders, will stall if just let it idle. I originally believed bottom plug wet w fuel but not so sure on that now. After replacing ignition parts, I put in and backed of trailer, knew immediately, down a cyl. But it ran to load back on trailer. Would fire up now on 2 cylinders. I’m baffled
 
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