Big Bore Kit

• Product Details

  150cc Kit:

  Made from the best components available on the market, our 150cc Big Bore kit is the perfect addition to upgrade your performance! The kit includes a ceramic coated cylinder, 54 mm forged piston, rings, pin and gasket kit. Its compression ratio of 11.38 to 1 will allow you to still use premium pump gas and keep the reliability of a stock motor.

  • Cylinder displacement: 150cc.
  • Cylinder material: Aluminum / ceramic coated.
  • Piston size: 54 mm.
  • Piston type: Forged.
  • Compression ratio: 11.38:1.
  • Kit includes: Piston ring, piston, pin, gasket kit and cylinder.

  170cc Kit:

  Want to unleash all the power your Honda GROM can handle? KOSO's 170cc Big Bore Cylinder kit for Honda GROM is the perfect addition for you! The kit includes a ceramic coated cylinder, 61 mm forged piston, rings, pin, gasket kit and banjo bolts. Its compression ratio of 11.5 to 1 will allow you to still use premium pump gas and keep the reliability of a stock motor. Made from the best components available on the market, KOSO's 170cc GROM big bore cylinder kit will amaze you!

  • Cylinder displacement: 169.2cc.
  • Cylinder material: Aluminum / ceramic coated.
  • Piston size: 61 mm.
  • Piston type: Forged.
  • Compression ratio: 11.5:1.

  Note: This is an aftermarket part built for racing purposes ONLY. Koso is not responsible for any damages caused to the parts, vehicle, or to yourself and others. Engine parts are not under warranty nor is collateral damage or cost of labor, in cases of malfunction.

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• Fitment

• # Part Numbers

  Product Variant	Manufacturer Part #
  150cc Koso Big Bore Kit	MB640000

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