KOSO NORTH AMERICA Valve Head Kit - Big Bore - Grom SEE TECH MB623003 Corsair-X Kiyonari Helmet Suitable for brake discs up

Suitable for brake discs up to 275 mm diameterEasy to install

Temperature range: 149°F to 248°F (EU: 65 to 120 °C)

Tensile strength: 9300 lbs

Just what your Yamaha R1 needs to clean up the tail section from Gravesport

Riders comfort and improved bike control were the driving force in developing this setup

KOSO NORTH AMERICA Valve Head Kit - Big Bore - Grom SEE TECH MB623003 Corsair-X Kiyonari Helmet Suitable for brake discs upIdeal engine part to complete Koso's big bore kit Unique four valve design increases air flow and performance Provides more power and torque Features a forged piston, stainless steel 24 mm intake valves and 20 mm exhaust valves