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Crankshaft

(193 products)
Scooter Crankshafts Bearings and Oil Seals Small End Bearings Crankshaft Accessories
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Product type
Bearing Bearing & gasket tool Connecting rod Crankcase Crankshaft Crankshaft accessories Crankshaft bearing Needle bearing Oil seal Oil seal kit Woodruff key O-ring
Brand
2Fast Airsal Athena Bidalot Derbi Doppler Jasil Malossi MotoForce MotoForce Racing Naraku Ottopuntouno Peugeot Piaggio Polini SKF Stage6 Stage6 R/T Standard Parts Top Performances Yamaha
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Standard Parts
Crankshaft 16 teeth 139QMB/QMA
Article no.: BT7001-16

Crankshaft 16 teeth 139QMB/QMA

43,00 €
Currently not in stock
44,00 €
-2% Discount
Naraku
Crankshaft bearings Naraku, Honda X8R
Article no.: NK100.75

Crankshaft bearings Naraku, Honda X8R

38,50 €
Currently not in stock
39,00 €
-1% Discount
Standard Parts
Crankshaft GY6 139QMA / 139QMB 16 teeth
Article no.: MF30.13900

Crankshaft GY6 139QMA / 139QMB 16 teeth

57,50 €
Currently not in stock
Standard Parts
Crankshaft OEM quality Yamaha Aerox 4-stroke
Article no.: CGN519894

Crankshaft OEM quality Yamaha Aerox 4-stroke

101,00 €
Currently not in stock
Yamaha
Crankshaft MBK Booster / Yamaha BW's after 2004
Article no.: OE-MAL5WWE14000200

Crankshaft MBK Booster / Yamaha BW's after 2004

352,00 €
Currently not in stock
Stage6 R/T
Crankshaft Bearing Set Stage6 R/T C4 steel Peugeot vertical
Article no.: S6-8031751/MET

Crankshaft Bearing Set Stage6 R/T C4 steel Peugeot vertical

35,00 €
Currently not in stock
RRP
38,00 €
-8% Discount
Stage6 R/T
Crankshaft Bearing Set Stage6 R/T C4 steel Peugeot horizontal
Article no.: S6-8031780/MET

Crankshaft Bearing Set Stage6 R/T C4 steel Peugeot horizontal

34,00 €
Currently not in stock
RRP
37,00 €
-8% Discount
Top Performances
Needle Bearing Set TPR clutch basket x2
Article no.: T9919070R

Needle Bearing Set TPR clutch basket x2

16,50 €
Currently not in stock
Peugeot
Crankcase LH Peugeot Kisbee 4T after '18
Article no.: OE-PEU803896

Crankcase LH Peugeot Kisbee 4T after '18

440,00 €
Currently not in stock
Peugeot
Crankshaft Peugeot vertical Euro2
Article no.: OE-PEU773483

Crankshaft Peugeot vertical Euro2

366,00 €
Currently not in stock
Yamaha
Crankshaft Minarelli 4-stroke
Article no.: OE-MIN5STE14001200

Crankshaft Minarelli 4-stroke

449,00 €
Currently not in stock
Polini
Connecting Rod Polini Evolution 10mm piston pin Minarelli
Article no.: P210.0007

Connecting Rod Polini Evolution 10mm piston pin Minarelli

92,50 €
Currently not in stock
RRP
100,00 €
-8% Discount
Malossi
Crankshaft Malossi RHQ 12mm pin Honda Dio
Article no.: M537604

Crankshaft Malossi RHQ 12mm pin Honda Dio

267,00 €
Currently not in stock
RRP
273,00 €
-2% Discount
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Scooter Crankshafts: Reliability and Performance

The cranktrain primarily refers to the crankshaft, crankshaft bearings, and oil seals. In our online shop, this category also includes piston pin bearings (small end bearings) as well as matching spare parts and accessories.

The crankshaft and its components require special attention regarding performance and reliability.

All components are available for the most popular models (Yamaha Aerox and Jog R, Piaggio Zip, NRG and Typhoon, Peugeot Kisbee and TKR, etc.) with engines from Minarelli, Piaggio, Peugeot, Kymco, Morini, or GY6.

Crankshaft

The crankshaft is the central component of the cranktrain. It must always match the cylinder: the more powerful the cylinder, the more robust the crankshaft should be. Depending on the setup, it is also important to ensure that the stroke and connecting rod length are compatible, as effective engine tuning is precision work.

To make selection easier, we have divided cylinders and crankshafts into performance levels: Original, Sport, Racing, and High-End.

We offer crankshafts from renowned brands such as Stage6, Stage6 R/T, Motoforce, Malossi, Polini, 2Fast, and many others.

Crankshaft Bearings and Oil Seals

Even in stock engines, it is usually not the crankshaft itself that wears out, but rather the bearings and oil seals. These should be replaced regularly, not only in tuned engines but also in original setups.

For tuned engines, reinforced bearings are explicitly recommended.

Our range includes brands such as Stage6 R/T, SKF, Polini, and Motoforce.

small end Bearings and Accessories

The small end bearing (needle bearing) is usually replaced together with the piston. However, since it sits on the connecting rod and its size also depends on it, it is assigned to the crankshaft category.

Warning: Always check for the correct size! Some cylinder kits use larger piston pins than the original.

Accessories include replacement connecting rods, woodruff keys (standard or offset for adjusting ignition timing), shims, and other specific components.

FAQ – Frequently Asked Questions about Crankshafts

→ Do I need to replace the crankshaft when increasing displacement? Yes. Original crankshafts are generally not designed for higher torque and increased RPM and should be replaced with a reinforced or racing version.

→ Can I replace the crankshaft myself? This is a demanding task that requires special tools. Without experience, it is recommended to leave this task to a professional to avoid damage. If you want to do it yourself, follow the workshop manual closely or use appropriate guides / tutorials.
Note: The same special tools are required for changing bearings and oil seals.

→ How do I recognize worn bearings? Strong, unusual vibrations throughout the vehicle are a typical sign. Often, a grinding or rumbling noise can be heard while the engine is running.

→ How do I recognize defective oil seals? Leaking oil seals allow false air into the engine, leading to a lean mixture. Typical symptoms include unstable idling, poor engine performance, and a light-colored / whitish spark plug.

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