I have a 1972 50ES72C Johnson 2-Stroke that died on cold startup and I now cannot get running. It was running okay a few days before.
I replaced the spark plugs because I could have fouled them.
No start.
I inspected/ohmed the coilpacks and replaced them with new OMC coilpacks. (Both new OMC secondary wires ohm out the same at 2100 ohms)
No start.
I disconnected the Black/Yellow kill switch wire from the powerpack.
No start.
The battery is charged to 12.8 volts.
When I test for spark with the new coils, I have no spark on cylinder one.
When I tested for spark with the old coils, I had no spark on cylinder two.
When I was testing the old coil, a switch of the primary lead at the powerpack between both cylinder one and the cylinder two lead, both powerpack leads sparked. (The old coil ohmed out at 270 ohms)
Lastly I installed two new OMC 0502890 coil kits, they both ohm at 2100 ohms on the motor, and now only cylinder two has spark.
I stopped there and ordered a repair manual, but would someone have experience with why the spark intermittently doesn't spark on cylinder two, and then, after installing new coil packs, has no spark on cylinder one?
I want to swap primary wires again, but both coilpacks are new and spec the same. My wrist is starting to beef up from taking the powerpack cover on and off with those flatheads.
I replaced the spark plugs because I could have fouled them.
No start.
I inspected/ohmed the coilpacks and replaced them with new OMC coilpacks. (Both new OMC secondary wires ohm out the same at 2100 ohms)
No start.
I disconnected the Black/Yellow kill switch wire from the powerpack.
No start.
The battery is charged to 12.8 volts.
When I test for spark with the new coils, I have no spark on cylinder one.
When I tested for spark with the old coils, I had no spark on cylinder two.
When I was testing the old coil, a switch of the primary lead at the powerpack between both cylinder one and the cylinder two lead, both powerpack leads sparked. (The old coil ohmed out at 270 ohms)
Lastly I installed two new OMC 0502890 coil kits, they both ohm at 2100 ohms on the motor, and now only cylinder two has spark.
I stopped there and ordered a repair manual, but would someone have experience with why the spark intermittently doesn't spark on cylinder two, and then, after installing new coil packs, has no spark on cylinder one?
I want to swap primary wires again, but both coilpacks are new and spec the same. My wrist is starting to beef up from taking the powerpack cover on and off with those flatheads.