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Hello all,
I'm new to this forum and i would first like to thank you all for your valuable information you have already offered on all the threads of this forum.
I'm facing an issue with my outboard Yamaha 2T 60hp 99-00 for more than a year now. While on plane after boating for a few minutes or while getting on plane under load it happens something like one cylinder is misfiring which is getting worse if i increase the throttle. Last summer this problem transformed from a sporadic event to a constant situation so i had the opportunity to further investigate it in my garage (this wasn't possible before as the issue happened only in the water and under load). After performing some measurements i found out that the input wire of one of the three ignition coils was totally black and corroded so i replaced it. This change seemed to permanently fix the issue. But a month ago and after a half our trip while i got off plane and after *****ing around while i tried to get again on plane the sporadic misfires started again! I removed all three ignition coils as well as the sparkplugs and i measured the resistance which was exactly as on spec. Today i took some measurements on the voltages across the coils all taken at 1500rpm.
CDI output: 75Volt on all three ignition coils instead of minimum of 145V ( according to service manual)
Charge coil: 245Volt instead of 160V
Pulser coil: 7Volt instead of 6.5V (that is the only measurement look to be in spec)
Lighting coil: 16Volt instead of 25V
Crank Position sensor: 9Volt instead of 20V.
All the above voltages was measured using a DMM and a DVA adapter. Because i wanted to be sure for the measurements i also used an oscilloscope which may offer a better view of the problem and also make available the waveforms to the community of the internet.
Check this video with all the waveforms i measured: https://www.youtube.com/watch?v=jnhCdYYC1XA
I'm new to this forum and i would first like to thank you all for your valuable information you have already offered on all the threads of this forum.
I'm facing an issue with my outboard Yamaha 2T 60hp 99-00 for more than a year now. While on plane after boating for a few minutes or while getting on plane under load it happens something like one cylinder is misfiring which is getting worse if i increase the throttle. Last summer this problem transformed from a sporadic event to a constant situation so i had the opportunity to further investigate it in my garage (this wasn't possible before as the issue happened only in the water and under load). After performing some measurements i found out that the input wire of one of the three ignition coils was totally black and corroded so i replaced it. This change seemed to permanently fix the issue. But a month ago and after a half our trip while i got off plane and after *****ing around while i tried to get again on plane the sporadic misfires started again! I removed all three ignition coils as well as the sparkplugs and i measured the resistance which was exactly as on spec. Today i took some measurements on the voltages across the coils all taken at 1500rpm.
CDI output: 75Volt on all three ignition coils instead of minimum of 145V ( according to service manual)
Charge coil: 245Volt instead of 160V
Pulser coil: 7Volt instead of 6.5V (that is the only measurement look to be in spec)
Lighting coil: 16Volt instead of 25V
Crank Position sensor: 9Volt instead of 20V.
All the above voltages was measured using a DMM and a DVA adapter. Because i wanted to be sure for the measurements i also used an oscilloscope which may offer a better view of the problem and also make available the waveforms to the community of the internet.
Check this video with all the waveforms i measured: https://www.youtube.com/watch?v=jnhCdYYC1XA
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