49cc Crankshaft
For GY6-50 QMB139 49-80cc Scooter Motors. Click Here for specs and fitment:


Part #: 633509
MSRP: $49.99
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This 49cc scooter crankshaft is the most popular one used by the off brand 50cc scooter manufacturers.
Overall Length: 247mm
Thread Size (tapered side): M10x11.5mm
Thread Size (spline side): M12x15mm
Bearing Outer Diameter (tapered side): 42mm
Bearing Outer Diameter (spline side): 47mm
Number of Splines: 26
Thin Gear=17th Thick Gear=16th
Tomos Nitro 50 # 13000-BE2-A003 This scooter Crankshaft fits most QMB139 (GY6-50), 49cc models.
E-Ton (Eton)# 811586 Not exact but Workable Part
E-Ton (Eton)# 813466 Direct Fit
Tomos Nitro 50 # 12191-BE2-A000



Common applications include:
Alta 50cc Alta-49 (Jonway) (Vin: TCB)
E-Ton 50cc Sport (ESport) (Vin: TCA)
  • Part #: 633509

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