SBT Jetski Engines, Parts & Accessories

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  1. #1
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    Default questions re yamaha 4 stroke crank bearings

    In relation to the sbt main and rod bearings for the yamaha 4 stroke cranks. What us the relation between the yamaha bearing colours specified in the manual and the 5 diff sizes in thd sbt kit.
    Standard. 2 over sizes and 2 undersizes.

  2. #2
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    Default Re: questions re yamaha 4 stroke crank bearings

    Quote Originally Posted by steelroe View Post
    In relation to the sbt main and rod bearings for the yamaha 4 stroke cranks. What us the relation between the yamaha bearing colours specified in the manual and the 5 diff sizes in thd sbt kit.
    Standard. 2 over sizes and 2 undersizes.
    There is no relationship to bearing color and the different sizes in the kit.

    SBT has made these plane bearings available in 2 ways.

    1) Color coded bearings. - The color coded bearings are available for customers wishing to use the color coding system that Yamaha uses on their crankshaft/connecting rods and cases.

    2) Engine builder kit. - The bearing kits are available for our customers that wish to use the method that an engine builder uses which is to measure outside dimensions of the crankshaft journals and the inside diameter of the crankcase and connecting rod journals. Then calculate the size needed from the various sizes available in the kit.
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