For installation these sizes you need to modify crankcase.
Forged crankshaft 60.8mm GY6-150 RUCKUS (57.8mm +3)
Forged crankshaft +3mm for GY6-150 157QMJ upgrade. Fits with cylinder sizes 61-63mm.
4 other products in the same category:
This is big bore set for Ruckus Gy6-150 engine. Set includes: cylinder kit, two valves cylinder head with bigger tunnels(input and output), special bendix, camshaft 6.0, rocker arm, racing CDI, powerful starter, racing CVT with forged drive face, light weight magneto, carburetor 29.5mm, manifold, air filter system. We have 2 options for your choice: 1....