Reply To: 1956 Johnson 30 hp won’t accelerate boat up on plane!

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November 27, 2020 at 11:02 am #221716
Ryles
Participant

    Easy test to see if it is running on one cylinder. With it running at high idle, pull a plug wire. If it keeps running, put that wire back on and pull the other. The motor WILL run on one cylinder. But if you pull the plug wire on the only one that’s firing then the motor will shut off.

    Another option is to put a timing light on the each wire while running.