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    Yamaha 150 loses 200-300 RPM

    I will be running at 3600 RPM and one of my engines loses 200-300 rpm and a few seconds later it goes back up to 3600. I have changed all gas filters and plugs. What else can I check?
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    Yamaha 150 not shifting

    I recently serviced the water pump on my 1990 150 Yamaha and now it won't shift into gear. Any ideas??
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