yam 150 no spark on left bank

[relayer78]

yamaha L150etxh (1987 rebuilt 1995)no spark on left bank of V6 as viewed from inside boat.plugs and gaps new and good. Motor does start and will run boat,but not over 3500rpm (both motors in gear).I have no test equipment.can be coils all 3? stator ?pulseor. or something I overlooked? Thank you,relayer78

[boats.net]

You need to test high speed charge coil, pulsor coils and CDI output as per service manual. Test the warning buzzer to see if working properly. If warning is activated the engine will go into RPM reduction.