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    Yamaha 1999 15hp 4 Stroke Misfires

    I recently purchased a 1999 Yamaha 15hp 4 stroke (carburetor). Motor started and ran great on muffs, so I purchased it knowing that on muffs is not the same as running, in the water, under load, WOT, on a boat. I put it on my boat and did a test run. I was not able to run it WOT due to carb...
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