Crankshaft - Stroker Crankshaft Hoca QMB139 > Part # 169GRS239
Grand Rapids Scooter's Hoca 44mm Stroker Crankshaft Assembly for 50cc 4-stroke QMB139 engines.
Supported Models: Bintelli, Tao Tao, Peace Sports, Wolf, Schwinn, Puma, SYM, Alliance, Motorino, and Kymco.
Specifications:
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Overall Length: 247mm
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Thread Size (tapered side): M10x1.25
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Thread Size (spline side): M12x1.25
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Bearing Outer Diameter (tapered side): 42mm
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Bearing Outer Diameter (spline side): 47mm
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Number of Splines: 26
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Connecting Rod Inner Diameter: 13mm
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Number of Teeth (oil pump drive gear): 16
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