Big bore kit that increases the engine displacement. Typically includes cylinder, piston, and the necessary gaskets.
Athena is an Italian manufacturer of cylinder kits, big bore kits, gasket sets, and oil seals for a wide range of models.
Fits these engines
- Brand: Athena
- Type: Big bore kit
- Engine brand: Yamaha
- Model: YZ450F
- Year: 2010-2017
- Part number: 420-0485-100054
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