MOOSE RACING Piston Kit - 42.95 mm - Cobra 65 MSE24106AB X1 Smartphone Bracket NOTE: Dyno Graph shown is

NOTE: Dyno Graph shown is with the moto1 slip-on and FTEcu Flash tune kit using the GravesSpec map available in the Graves section of Flash Tune's database

8 lbs over stock

1 Bosch LSU4

Stock Muffler: 11

Just what your Yamaha XSR900 needs to clean up the tail section from Gravesport

MOOSE RACING Piston Kit - 42.95 mm - Cobra 65 MSE24106AB X1 Smartphone Bracket NOTE: Dyno Graph shown isMoose Racing pistons feature X style forgings and fully boxed style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction Pro Race Piston increases the durability by reducing the stresses in the pin bore area Pro Race Piston allows the pin to flex while removing stress from the area Full radius dome designs maximize quench while eliminating hot spots that promote detonation Internal bracing