MX | ROADRACE | KARTING | MOPED
Increase your engine's power with our VHM cylinder head, insert, 12° piston kit and high inertia crankshaft, optimized with our VHM ignition map from our CDI unit. The crankshaft will transfer the power output smoothly to the rear wheel for better traction, handling and faster driving. The quality of our crankshaft definitely exceeds OEM, considerably leading to less vibrations and less runout.
This upgrade kit contains our 12 degree VHM piston, which can only be used in combination with our special insert for 12° piston.
Upgrade kit parts explained
Dyno video of Yamaha YZ85 with VHM cylinder head and insert