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1986 140HP no spark on 1 & 3

rude70

Contributing Member
Hi I am working on my friends Yamaha 140AET0.

There is no spark on cylinders 1 & 3, but there is spark on 2 & 4.

I swapped the CDI 2 & 4 outputs an connected to coils 1 & 3 and there was spark - so coils must be ok

Is the issue likely to be the power pack or the trigger/pulse coils? I have down loaded the manual but was looking for a few pointers cos the power pack is $500!!

Thanks
 
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