SBT Jetski Engines, Parts & Accessories

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  1. #1
    Joined
    Aug 2015
    From
    New York
    Posts
    1

    Default 1998 Yamaha XL760 quit and won’t start

    My XL760just died while riding on the river the other day. I cannot get it to start. Spark is good, and I replaced the plugs. It backfires through the back carburetor now that I changed the plugs. It has an SBT premium motor that was put in last spring with only about 30 hours on it. The compression in the front cylinder is low, the gauge reads about 60 lbs. the back cylinder reads 120 lbs. any ideas what could have caused this out of the blue? I guess I will have to pull the engine and take advantage of the warranty.

  2. #2
    Joined
    Jun 2016
    From
    Clearwater, Florida
    Posts
    278

    Default Re: 1998 Yamaha XL760 quit and won’t start

    With a big discrepancy between the two compression readings I would expect a lean issue in one cylinder causing the piston to "melt" and lose compression.

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