Tweet
This is a good puzzler and all the common things have been addressed.
I am getting ready to turn key to start a recently rebuilt Yamaha 220, but there is no spark when cranked. The block was punched 0.020" over with new pistons/rings and bearings. The powerhead is assembled and back on the midsection. All electronics were marked before disassembly and are connected properly. I am using all the Yamaha wiring harnesses and they have tested good. I have traced ignition cut off and all the other most common things and they are fine. I can crank, but do not get any spark.
The following check fine (per factory manual):
- Throttle position sensor- 20, 1 and 1 Ohm - good
- knock sensor- good
- Pulsar coil - good @ 360 Ohms all 6 ways)
- Charge and lighting coils also fine
- 6 coils- good
- CDI unit- tested with VOM meter and all readings are good, even swapped with another motor and still no spark. I have no way of testing with the Yamaha 1-Y tester which I'm thinking I should do.
Bypassed computer control by way of under cowel connections, still no spark.
Since the motor is on a stand in my garage it's a little difficult to take to a dealer for diagnosis.
Since the motor ran before, I doubt anything would have failed. Any ideas??
D-
I am getting ready to turn key to start a recently rebuilt Yamaha 220, but there is no spark when cranked. The block was punched 0.020" over with new pistons/rings and bearings. The powerhead is assembled and back on the midsection. All electronics were marked before disassembly and are connected properly. I am using all the Yamaha wiring harnesses and they have tested good. I have traced ignition cut off and all the other most common things and they are fine. I can crank, but do not get any spark.
The following check fine (per factory manual):
- Throttle position sensor- 20, 1 and 1 Ohm - good
- knock sensor- good
- Pulsar coil - good @ 360 Ohms all 6 ways)
- Charge and lighting coils also fine
- 6 coils- good
- CDI unit- tested with VOM meter and all readings are good, even swapped with another motor and still no spark. I have no way of testing with the Yamaha 1-Y tester which I'm thinking I should do.
Bypassed computer control by way of under cowel connections, still no spark.
Since the motor is on a stand in my garage it's a little difficult to take to a dealer for diagnosis.
Since the motor ran before, I doubt anything would have failed. Any ideas??
D-
Comment