We have 7 ready to ship.
The race version of the popular Athena 70cc big bore kit, available in one part number. All parts are available separately for custom builds.
Features:
- Cylinder kits include cylinder, head, piston assembly, reeds, and gaskets
- Piston kits include piston, rings, wrist pin, and circlips
- Carburetors have a manual choke assembly
- Hyper Race crankshafts have a lighter connecting rod, full crank rounds, and special needle bearings, but will not work with OEM type stock or standard Athena big bore pistons due to the larger 12mm wrist pin size.
Fitment:
2001 Yamaha YJ50 Vino
2002 Yamaha YJ50 Vino
2002 Yamaha YJ50RA Vino Classic
2002 Yamaha YW50 Zuma
2003 Yamaha YJ50 Vino
2003 Yamaha YJ50RA Vino Classic
2003 Yamaha YW50 Zuma
2004 Yamaha YJ50 Vino
2004 Yamaha YJ50RA Vino Classic
2004 Yamaha YW50 Zuma
2005 Yamaha YJ50RA Vino Classic
2005 Yamaha YW50 Zuma
2008 Yamaha YW50 Zuma
2009 Yamaha YW50 Zuma
2010 Yamaha YW50 Zuma
2011 Yamaha YW50 Zuma
2013 Yamaha CW50 Zuma II