snook-fil-a
New member
2000 Yamaha 90HP 2 Stroke C90TLRY
I have been chasing a spark issue around for weeks.
Symptoms:
- removed plugs, holding one plug attached to boot and touching the engine I only get 2 seconds of spark while cranking and then spark stops but engine is still trying to turn over
- when CDI is put into emergency bypass, it sparks fine
- when crankshaft position sensor is unplugged, it sparks fine
What I've done:
- tested resistance and voltage with the following components unplugged (using a peak voltage meter): pulsor coil, stator, and crankshaft position sensor
- pulsar coil and stator passed per yamaha manual specs for "open"
- crankshaft position sensor did not pass the voltage test - spec if 5.5v min and got 4.79v
- replaced CPS with brand new one from boat.net and still same problem - new CPS shows 5.2V open - still out of spec?
- swapped CDI with used CDI that owner swears works - same problem - he gladly took it back
- tried brand new hardness and switch - same problem
Going nuts here. I feel like the fact that the motor sparks fine when the crank pos. sensor is disconnect and or when CDI is in bypass mode should point to something. I thought it was a bad CPS especially since it tested low but even the new part tests low and does the same thing.
For the love of God someone please give me some guidance!!
I have been chasing a spark issue around for weeks.
Symptoms:
- removed plugs, holding one plug attached to boot and touching the engine I only get 2 seconds of spark while cranking and then spark stops but engine is still trying to turn over
- when CDI is put into emergency bypass, it sparks fine
- when crankshaft position sensor is unplugged, it sparks fine
What I've done:
- tested resistance and voltage with the following components unplugged (using a peak voltage meter): pulsor coil, stator, and crankshaft position sensor
- pulsar coil and stator passed per yamaha manual specs for "open"
- crankshaft position sensor did not pass the voltage test - spec if 5.5v min and got 4.79v
- replaced CPS with brand new one from boat.net and still same problem - new CPS shows 5.2V open - still out of spec?
- swapped CDI with used CDI that owner swears works - same problem - he gladly took it back
- tried brand new hardness and switch - same problem
Going nuts here. I feel like the fact that the motor sparks fine when the crank pos. sensor is disconnect and or when CDI is in bypass mode should point to something. I thought it was a bad CPS especially since it tested low but even the new part tests low and does the same thing.
For the love of God someone please give me some guidance!!