The Taida Racing crankshaft with a 66mm stroke (part number 8200) is a high-performance aftermarket engine component designed for GY6 125cc to 150cc engines, particularly 4-valve (4V) configurations. It replaces the original crankshaft to offer:
a longer piston stroke,
improved inertia and a more linear engine response,
the ability to reach higher RPMs (approaching 8200 RPM depending on the configuration),
robust performance suitable for sport and racing builds.
The 66mm stroke increases the engine's effective displacement (when combined with a suitable bore), improving low- and mid-range torque, while also allowing for more efficient use of the characteristics of 4-valve cylinder heads and camshafts.
This crankshaft is factory balanced and precision machined to minimize vibrations at high RPM and withstand the high dynamic loads associated with modified engines.
