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    1999 Polaris Sport 400 Engine

    1999 Polaris Sport 400
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    QuadBoss Crankshaft Bearing Kit Features Koyo precision Japanese crank bearings Seals feature a carbon/fluorocarbon pad on the seals lip and stainless steel garter springs Helps reduce start up frict
    WSM Top-End Rebuild Kit Top-End Rebuild Kit Includes: Pistons Rings Pins Clips Needle bearings Head and base gaskets Intake and exhaust gaskets *Note: Image is for reference only.

    Latest Reviews

    Jake (Colchester, CT)

    Fit
    Quality
    Installation
    Recommend

    Was good...

    Fit great and was an easy installation but blew it first time I took it to the track.

    Sean (Los Angeles, CA)

    Fit
    Quality
    Installation
    Recommend

    Replaced the top end on my 96 cr125r! Fit great perform well but the price is the problem. For 70-80 bucks they'd be perfect!

    simon (berkshire, BRK)

    Fit
    Quality
    Installation
    Recommend

    lully job

    Ordered my wiseco bottom end kit and everything fell together. Fired up second kick, now first time everytime! I will run it very gently, because that is absolute key in a good engine as some do thrash and wonder why the cranks snapped or flattened bearings!!

    Alejandro (brooklyn, NY)

    Fit
    Quality
    Installation
    Recommend

    CLEAN finish

    Just tops off any bike to become better. I love it!!

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