30hp yamaha outboard not firing one 1 cylinder

sambrigman

Petty Officer 1st Class
Joined
Jan 29, 2010
Messages
210
i have 1 plug that is very slightly firing, new plug, and new coil still tiny fire, any ideas where i might check next any suggestions greatly appreciated, thanks guys
 

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
9,094
measuring the peak voltage into and out of the CDI and comparing those readings to spec in service manuual may tell you if there is a problem with a charge coil, pulser coils, etc.

It is very hard to know what tiny fire means
 
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