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    92 Yamaha 40 Precision Blend Running Rough

    I have this motor on 13 Whaler and it runs rough WOT - never smooth at low to mid Rs but great at WOT since I have owned it. I use Yamalube and Seafoam. I believe the carbs need to be rebuilt/cleaned and want to learn to do myself. I bought Chilton and Seldoc manuals and they are not specific...
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    92 Yamaha 40 runs rough, misses

    New, to me, Yam 40 3 cyl, oil injection, runs rough just above idle, middle power settings, but runs fantastic after plane and WOT. I have followed decarbon procedures and cleaned carberators with Seafoam, use good gas, etc and noticed improvements but cannot smooth out (rough and occasionaly...
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