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Engine Kits

Big bore engine kits for a Harley-Davidson engine involves replacing the stock cylinders and pistons with larger ones, effectively increasing the engine's overall displacement. This modification aims to improve the overall performance of the motorcycle. The larger cylinders allow for more air and fuel to be combusted, resulting in increased power and torque. Riders often choose this upgrade to enhance acceleration, throttle response, and overall riding experience. It's a customization option for those seeking a more powerful and performance-oriented Harley-Davidson motorcycle.
  • Original price $595.95 - Original price $595.95
    Original price
    $595.95
    $595.95 - $595.95
    Current price $595.95

    MHP +6.4cc Pistons for S&S 4.250" Bore Cylinders 128/131 cubic inch setups MHP-P4250

    In stock

    Moonshine Horsepower +6.4cc Pistons are designed to be a direct replacement for 4.250" S&S 128 and 131 setups when running a high horsepower ca...

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    Original price $595.95 - Original price $595.95
    Original price
    $595.95
    $595.95 - $595.95
    Current price $595.95
  • Original price $3,389.75 - Original price $3,389.75
    Original price
    $3,389.75
    $3,389.75 - $3,389.75
    Current price $3,389.75

    MHP 4.250" bore High HP Complete Upgrade Kit - Oil Cooled Heads - MHP-5050

    In stock

    Moonshine Horsepower +6.4cc Pistons are designed to be a direct replacement for 4.250" S&S 128 and 131 setups when running a high horsepower ca...

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    Original price $3,389.75 - Original price $3,389.75
    Original price
    $3,389.75
    $3,389.75 - $3,389.75
    Current price $3,389.75
  • Original price $2,299.99 - Original price $2,299.99
    Original price
    $2,299.99
    $2,299.99 - $2,299.99
    Current price $2,299.99

    Moonshine Power Kit 128, black w/o highlights, oil cooled M8

    In stock

    Moonshine HP Power Kit by S&S Cycles - Cylinders black w/highlights - Oil Cooled Pump & Plate - 0904-0081 We have worked directly with S&am...

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    Original price $2,299.99 - Original price $2,299.99
    Original price
    $2,299.99
    $2,299.99 - $2,299.99
    Current price $2,299.99
  • Original price $2,299.00 - Original price $2,299.00
    Original price
    $2,299.00
    $2,299.00 - $2,299.00
    Current price $2,299.00

    Moonshine Power Kit 128 Black w/highlights, oil cooled M8

    In stock

    Moonshine Power Kit by S&S Cycles - Cylinders black w/highlights - Oil Cooled Pump & Plate - 0904-0079 We have worked directly with S&S...

    View full details
    Original price $2,299.00 - Original price $2,299.00
    Original price
    $2,299.00
    $2,299.00 - $2,299.00
    Current price $2,299.00