ship wreck
Contributing Member
78 Johnson 140. Was running great then last weekend it would not idle in the water but it ran on the muffs before heading out. After some messing around with it I gave up and called it a day. I found a chunk of debris in the fuel filter so I went through the fuel system for good measure and the motor seemed to be running fine. Took it back to the lake and same thing, would not idle in the water. . Will run on the muffs but not in the water.
Back at the house on the muffs it again would run ok. I checked the timing and it was spot on, checked for spark on each cylinder with a timing light and they all are firing, So I started to dig deeper. Checked the rectifier, good, checked the power pack diodes, good, checked the stator DVA at idleish 200, good. Checked the DVA input to the coils and it's only 2 volts. How could that be and the motor even run? Looked at the coils and the low side resistances are out of spec per the clymer but in spec per CDI. except for one that reads open on the high side. I think this coil has given up as the motor is missing pretty bad now.
Question is do those DVA readings to the coil make sense?
I had a hard time getting a consistent reading on one of the other coils which leads me to believe there is a plug wire issue. Am I best off to just replace all four coils as they appear to be original?
Back at the house on the muffs it again would run ok. I checked the timing and it was spot on, checked for spark on each cylinder with a timing light and they all are firing, So I started to dig deeper. Checked the rectifier, good, checked the power pack diodes, good, checked the stator DVA at idleish 200, good. Checked the DVA input to the coils and it's only 2 volts. How could that be and the motor even run? Looked at the coils and the low side resistances are out of spec per the clymer but in spec per CDI. except for one that reads open on the high side. I think this coil has given up as the motor is missing pretty bad now.
Question is do those DVA readings to the coil make sense?
I had a hard time getting a consistent reading on one of the other coils which leads me to believe there is a plug wire issue. Am I best off to just replace all four coils as they appear to be original?