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 various models.
Fits these engines
- Yamaha WR450F 2007-2015
- Yamaha YZ450F 2006-2009
- Brand: Athena
- Type: Big bore kit
- Engine brand: Yamaha
- Model: WR450F, YZ450F
- Year: 2006-2015
- Part number: 420-0485-100021
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