Yamaha off-road motorcycle // sport atv athena 290cc big bore kits
Engine / performance
Big Bore Cylinder Kits include: brand new nickel-carbideplated
cylinder with enlarged water passages, precision
made piston with rings, pins, clips, gaskets, O-rings, and all
other parts needed for a complete installation
Note: Piston Kits include piston, rings, pin and clips.Note: This accessory affects emissions; installation on EPA-regulated 2006 or later WR models constitutes unlawful tampering except when used solely for closed-course
competition. YZ models are for closed-course use regardless of modification.
Note: This performance accessory does not meet California standard for off-road recreational vehicle usage regardless of model year.
Yamaha off-road motorcycle // sport atv athena 290cc big bore kits
Yamaha off-road motorcycle // sport atv athena 290cc big bore kits