KOSO

Koso ceramic coated big bore cylinder kit forged w/4-valve piston and gasketsKoso 4-valve cylinder head (complete with camshaft, rocker arms, intake manifold, and all other parts shown in the...

Intake tube allows for higher air volume to enter the stock Grom airbox

Intake manifold port is larger than stock and is size matched to use with the Koso throttle bodyInclude all gaskets needed and instructions

The Koso 4V Head Kit is the ideal engine part to complete the Koso Honda Grom® Big Bore kit. Because of its unique 4 valve design, the air flow and performance are increased. This new designed head...

34mm Throttle body for increased performance compared to stock 30.5mm throttle bodyIntake manifold port is larger than stock and is size matched to use with the Koso throttle bodyIncludes all gaskets...

The Koso 240┬░ camshaft increases power and torque compared to the stock camshaftCan be used with a stock engine, or for optimal gains, use with the Koso 170cc Big Bore KitNot legal for use in...