Crankshaft Bt7001-22Crankshaft with 22 tooth oil pump driven sprocket for 139QMB QMAOriginal quality aftermarket crank for 50 90cc 4 stroke engines (GY6 50, 139QMB QMA. The crank is pre pressed with main bearings and rod GY6 engines are factory fitted with 2 different versions of crank The only difference is the oil pump drive cog on the right hand side The old version, installed in almost all vehicles, has a 16 tooth cog The new version has 22 teeth and is used in e.
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