Recent content by JeffJay

  1. J

    Yamaha 9.9hp 4-stroke erratic spark at high rpm

    I’ve read a lot of great things on these forums after finding this site recently, but still can’t seem to nail down my problem. Motor starts easy on first pull, but runs rough with misfires at higher rpm, and timing light shows no spark with the miss-fires. I’ve checked resistance and peak...
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