09-14 Yamaha R1 Graves Motorsports Lower 50mm Velocity Stacks
2009-2014 Yamaha R1 Graves Motorsports Lower 50mm Velocity Stacks Graves Motorsports Yamaha R1 Lower 50mm Velocity Stacks for the 2009-2011 models. These 50MM Lower Velocity Stacks with Pivots were developed by Graves Motorsports for your Cross Plane Crank R1. This item is the "Lower" stack assembly only (see item # ABY-09R1-REVT to purchase the top add-on). This stack kit improves power throughout the entire RPM range. The...