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Max 50139QMB-based 50cc / 80cc engines with the following engine codes 139QMA 139QMB 1P39QMB 1P39QMA-2YN139QMB JJ1P39QMB 139FMA-2 BD1P39QMBBN139QMB 147QMD Other QMA models Other QMB models157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes 157QMJ 161QMK 152QMI 1P61QMKYN1P57QMJ 1P52FMI 154FMI JJ157QMJ1P57QMJ BN157QMJ BN161QMK-A Other QMJ QMK QMI modelsAbout Prima: Prima stands at the forefront of stylish
BN157QMJ and most 150cc GY6 clones
Customizer's Tip: Since this frame leaves the area under your seat more visible
A 1000 RPM spring engages the higher gear range sooner than a higher-rated spring
Inner Diameter (bell): 105mm
Mazzucchelli Crankshaft; Vespa P/PX oem Max 50139QMB-based 50cc / 80ccMazzucchelli OEM style 57mm replacement crankshaft for vintage Vespa 125 150cc P PX , Sprint, Sprint Veloce, and Super model scooters. NOTE: If you're putting a cylinder kit on one of these models listed, make sure you get a crank that can stand up to the increased RPMs. Specifications: Stroke: 57mm Connecting rod length: 105mm Connecting rod bearing dimensions: 15mm x 19mm x 20mm Connector pin length: 15mm Cone: 24 25mm Oil seal seat (flywheel side):
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