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Force 90 no spark on top cylinder

N

NoahG

New member
Hello everyone, I have been trying to figure out a no spark issue on one (top) cylinder.

The motor is a 1991 Force 90 with blue ignition components.

Compression is as follows:
Top = 115psi
Middle=125psi
Bottom=120psi

This is what I have tried so far:

Swapped spark plugs

Swapped coil pack and trigger wires - problem didn’t follow coil.

Removed each wire from terminal board one by one and removed and replaced heat shrink to verify wires aren’t broken.

Connected top coil to the unused circuit on CD box and swapped trigger wires - No change

Removed flywheel and visually inspected stator - nothing looks out of the ordinary.

I have tried to follow the outboardignition.com test procedures but some are a bit vague.


Any help is greatly appreciated!
 
outboardignition.com has test procedures for the stator.
Most test need a special meter. The test you can do needs a sweep type meter.
The DVA or Peak Reading Volt Meter will give the best results.
It can look good and even test good but still be bad.
Your list of things you tried is exactly what I would have suggested(good job)
 
Thanks for the reply. Sorry it took a while but I ordered and received my DVA adapter.

The procedure on outboardignition.com states “stator reads 680-800 ohms, DVA 180V or more from blue to yellow.”

I don’t see a blue wire coming from the stator. What I do have are Brown w/ Blue stripe, and Brown w/ Yellow stripe. Are these the wires they are referring to? These wires lead to the terminal board.

I did connect the meter to these two wires but could not get a stable reading while cranking.
 
I installed a new stator from CDI. I now get a dva reading of around 400 volts when testing the blue and yellow wires from the stator.

Unfortunately, still no spark on the top cylinder.
 
Check the trigger: the wires from the trigger are VERY thin and they tend to break at the connector under the shrink wrap.
Do the tug test, pull on each of the wires and see if it broken at the connector.
 
Jerryjerry05 said:
Check the trigger: the wires from the trigger are VERY thin and they tend to break at the connector under the shrink wrap.
Do the tug test, pull on each of the wires and see if it broken at the connector.
Click to expand...
None of the trigger wires are broken as far as I can tell. When testing across the trigger wire sets I have my meter set to ohms on the 200 range. The reading is 550 between sets.
 
I tested the trigger. Ohms are good, and I swapped each pair of wires to a known good coil/cylinder and each combo had spark.

I also verified all coils are good by doing a similar test. So that leaves the two CD boxes. I was unable to verify which is bad, or if both are bad. Cylinders 2&3 have very strong spark, and cylinder 1 has a very weak spark.
 
I bought a used CD pack on Ebay for a reasonable price. I now have spark on all cylinders. Put it in the water and it’s running great!

Thanks to all for the suggestions and sharing of knowledge.
 
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