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    detonation?

    can anyone tell me what pre-ignition and detonation sounds like? appreciate the help.
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    1979 johnson 115 low power, will not get up on plane

    I just bought this boat and motor. Has been sitting for 1 year with old gas. I changed the old fuel and oil mix with fresh fuel, also replaced the old spark plugs and gapped to .040.<br />Out on the water it idled fine. I then proceded with throttle and it began to miss/hesitate a little until...
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    1979 johnson 115 low power

    thanks in advance for the help. I just bought a used boat and motor and I drained out the old gas, changed the spark plugs and gapped them to .040. Took it out on the water and it idled fine. I then proceded to wide open throttle and it had very little power. It only went up to 2500 rpm. Also it...
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