crankshaft Doppler ER1 left-hand thread for MBK 51 Motobecane Mobylette AV10 52449

The Doppler ER1 racing crankshaft is forged and balanced with aluminium inserts that reduce dead volume in the lower part of the engine while ensuring maximum balance and good moment of inertia. The forged connecting rod is heat treated and mounted with a nickel-chromium-silver bearing with INA needle cage for high engine speeds.

Left-hand thread for ignition!

Piston pin: 13mm

Stroke: as original

Connecting rod: as original