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Thread: 750 vs780 bore

  1. #1

    750 vs780 bore

    whats the bore on a 750 vs the 780?


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    750 = 69.72mm

    780 = 71.3mm

  3. #3
    thanks do you know if the wrist pin height is the same? is it just the bore thats different ?

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Don't know????

  5. #5

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    The Piston Pin Heights are the same. The Pistons and Cylinders will bolt right on your 750 cases. The Cranks are 100% the same the cases are the same other then the tunnel ports and will work fine without. Its a Very easy swap out you just need 780 cylinders, heads and exhaust manifold Oh and 780 pistons and Gaskets of course.

    Rejet your carbs to the 780 specs and your golden.

    When I need a larger piston on the 750 engine that are past the largest bore I use the 780 pistons

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