Graves motorsports lower 50mm velocity stacks R1 2009-2014 ABY-09R1-REVB Complete Clutch Kit OEM color-matched for direct replacement

OEM color-matched for direct replacement

mounted with plastic screws designed to break on impact

8:1 air/fuel ratio

GB Racing covers are FIM approved and proven at the highest levels worldwide

Replacement cheek pads for Arai VX-Pro4 helmets

Graves motorsports lower 50mm velocity stacks R1 2009-2014 ABY-09R1-REVB Complete Clutch Kit OEM color-matched for direct replacementGraves Motorsports Yamaha R1 Lower 50mm Velocity Stacks for the 2009 2014 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 staggered tops allow the cylinders to share the available volume of air in the R1s air box