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Crankshaft

(125 products)
50cc Bike Crankshafts Bearings and Oil Seals Small End Bearings Crankshaft Accessories
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Product type
Bearing Bearing & gasket tool Clutch gear Connecting rod Crankshaft Crankshaft bearing Needle bearing Oil seal Oil seal kit Washer Woodruff key Counterbalance shaft O-ring
Brand
2Fast Airsal Barikit Bidalot Conti Derbi Doppler Italkit Jasil Malossi Metrakit MotoForce MotoForce Racing MVT Naraku Parmakit Polini Rieju SKF Stage6 Stage6 R/T Standard Parts Top Performances Voca Racing Yamaha
Price
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MotoForce
Ignition Woodruff Key 2.5x3.7mm Derbi
Article no.: MF60.19315

Ignition Woodruff Key 2.5x3.7mm Derbi

1,40 €
In stock
MotoForce
Crankshaft reinforced MotoForce 20mm journal AM6
Article no.: MF30.11001
7

Crankshaft reinforced MotoForce 20mm journal AM6

58,50 €
In stock
RRP
69,00 €
-15% Discount
MotoForce
Small End Bearing Motoforce
Article no.: MF33000_MF_AGUILLES
125

Small End Bearing Motoforce

from 2,40 €
In stock
6,60 €
-64% Discount
MotoForce
Crankshaft reinforced MotoForce Derbi Euro 3 / 4
Article no.: MF30.19300
13

Crankshaft reinforced MotoForce Derbi Euro 3 / 4

60,00 €
In stock
MotoForce
Crankshaft Bearing Set Derbi
Article no.: MF33.12502
10

Crankshaft Bearing Set Derbi

22,50 €
In stock
MotoForce
Crankshaft Bearing Set AM6
Article no.: MF33.11005
13

Crankshaft Bearing Set AM6

21,50 €
In stock
RRP
22,00 €
-2% Discount
MotoForce
Crankshaft OEM MotoForce Derbi Euro 3 / 4
Article no.: MF30.19306

Crankshaft OEM MotoForce Derbi Euro 3 / 4

54,50 €
In stock
56,50 €
-4% Discount
MotoForce
Counterbalance Shaft AM6
Article no.: MF60.18813

Counterbalance Shaft AM6

17,00 €
In stock
RRP
22,00 €
-23% Discount
Sale
MotoForce
Oil Seals crankshaft Derbi
Article no.: MF96.00034
8

Oil Seals crankshaft Derbi

6,00 €
In stock
RRP
6,10 €
-2% Discount
MotoForce
Oil Seals crankshaft AM6
Article no.: MF96.00035
8

Oil Seals crankshaft AM6

6,10 €
In stock
RRP
6,50 €
-6% Discount
MotoForce
Crankshaft Motoforce Derbi Euro 2
Article no.: MF30.12500
9

Crankshaft Motoforce Derbi Euro 2

47,00 €
In stock
RRP
54,00 €
-13% Discount
MotoForce
Crankshaft Motoforce AM6
Article no.: MF30.11000
14

Crankshaft Motoforce AM6

52,00 €
In stock
RRP
56,50 €
-8% Discount
Stage6
Crankshaft Stage6 HPC Derbi Euro 3 / 4
Article no.: S6-8019300
4

Crankshaft Stage6 HPC Derbi Euro 3 / 4

199,00 €
In stock
RRP
221,00 €
-10% Discount
Stage6
Small End Bearing Stage6 High Quality silver
Article no.: S6-8020_SIZES
198

Small End Bearing Stage6 High Quality silver

from 7,00 €
In stock
12,00 €
-42% Discount
Stage6
Crankshaft Stage6 HPC 45mm stroke Derbi Euro 2
Article no.: S6-8019210
1

Crankshaft Stage6 HPC 45mm stroke Derbi Euro 2

219,00 €
In stock
RRP
243,00 €
-10% Discount
Stage6
Crankshaft Stage6 HPC 45mm stroke Derbi Euro 3 / 4
Article no.: S6-8019310
3

Crankshaft Stage6 HPC 45mm stroke Derbi Euro 3 / 4

197,00 €
In stock
RRP
243,00 €
-19% Discount
Sale
Stage6
Crankshaft Stage6 Pro Replica Derbi Euro 3 / 4
Article no.: S6-8119300
2

Crankshaft Stage6 Pro Replica Derbi Euro 3 / 4

116,00 €
In stock
RRP
143,00 €
-19% Discount
Sale
Stage6
Crankshaft Stage6 Pro Replica AM6
Article no.: S6-8118800
3

Crankshaft Stage6 Pro Replica AM6

134,00 €
In stock
RRP
148,00 €
-9% Discount
Stage6
Crankshaft Stage6 HPC MK2 AM6
Article no.: S6-8018801
8

Crankshaft Stage6 HPC MK2 AM6

225,00 €
In stock
RRP
250,00 €
-10% Discount
Stage6
Crankshaft Stage6 HPC 44mm stroke AM6
Article no.: S6-8018809

Crankshaft Stage6 HPC 44mm stroke AM6

160,00 €
In stock
RRP
221,00 €
-28% Discount
Sale
Stage6
Albero motore Stage6 HPC Derbi Euro 3 / Euro 4 corsa 44mm
Article no.: S6-8019309

Albero motore Stage6 HPC Derbi Euro 3 / Euro 4 corsa 44mm

162,00 €
In stock
RRP
221,00 €
-27% Discount
Sale
Stage6
Dummy Bearings 6303 Minarelli AM6 (x2)
Article no.: S6-8039101

Dummy Bearings 6303 Minarelli AM6 (x2)

10,00 €
In stock
RRP
12,00 €
-17% Discount
Sale
Stage6
Dummy Bearings 6204 Minarelli / Derbi (x2)
Article no.: S6-8039100

Dummy Bearings 6204 Minarelli / Derbi (x2)

10,00 €
In stock
RRP
12,00 €
-17% Discount
Sale
Stage6
O-Ring oil filler cap Stage6 Piaggio
Article no.: S6-SSP141ET01

O-Ring oil filler cap Stage6 Piaggio

0,90 €
In stock
1,20 €
-25% Discount
Stage6 R/T
Crankshaft Bearing Kit Stage6 R/T C3 metal cage 17 / 20mm AM6
Article no.: S6-8031882/MET

Crankshaft Bearing Kit Stage6 R/T C3 metal cage 17 / 20mm AM6

35,00 €
In stock
RRP
38,00 €
-8% Discount
Stage6 R/T
Crankshaft Stage6 R/T 44mm stroke / 95mm conrod Derbi Euro 3 / 4
Article no.: S6-7919305

Crankshaft Stage6 R/T 44mm stroke / 95mm conrod Derbi Euro 3 / 4

265,00 €
In stock
RRP
421,00 €
-37% Discount
Sale
Stage6 R/T
Crankshaft Stage6 R/T 44mm stroke / 90mm conrod AM6
Article no.: S6-7918805

Crankshaft Stage6 R/T 44mm stroke / 90mm conrod AM6

265,00 €
In stock
RRP
421,00 €
-37% Discount
Sale
Stage6 R/T
Crankshaft Stage6 R/T AM6
Article no.: S6-7918801

Crankshaft Stage6 R/T AM6

249,00 €
In stock
RRP
276,00 €
-10% Discount
Stage6 R/T
Oil Seals crankshaft + water pump Stage6 R/T Derbi
Article no.: S6-8041939

Oil Seals crankshaft + water pump Stage6 R/T Derbi

16,00 €
In stock
RRP
20,00 €
-20% Discount
Sale
Stage6 R/T
Oil Seals crankshaft + water pump Stage6 R/T Minarelli AM6
Article no.: S6-8041889

Oil Seals crankshaft + water pump Stage6 R/T Minarelli AM6

16,00 €
In stock
RRP
20,00 €
-20% Discount
Sale
Stage6 R/T
Crankshaft Seals Stage6 R/T FKM 20x35x7mm Derbi Euro 2 / 3 / 4
Article no.: S6-8041931

Crankshaft Seals Stage6 R/T FKM 20x35x7mm Derbi Euro 2 / 3 / 4

17,00 €
In stock
Stage6 R/T
Crankshaft Oil Seals Stage6 R/T FKM Minarelli AM6
Article no.: S6-8041881

Crankshaft Oil Seals Stage6 R/T FKM Minarelli AM6

17,00 €
In stock
Stage6 R/T
Crankshaft Bearing Set Stage6 R/T C3 polymer cage Derbi
Article no.: S6-8031931/TN9

Crankshaft Bearing Set Stage6 R/T C3 polymer cage Derbi

39,50 €
In stock
RRP
43,00 €
-8% Discount
Stage6 R/T
Crankshaft Bearing Set Stage6 R/T C3 steel cage Derbi
Article no.: S6-8031931/MET

Crankshaft Bearing Set Stage6 R/T C3 steel cage Derbi

35,00 €
In stock
RRP
38,00 €
-8% Discount
Stage6 R/T
Crankshaft Bearing Set Stage6 R/T C3 polymer 20mm AM6
Article no.: S6-8031881/TN9

Crankshaft Bearing Set Stage6 R/T C3 polymer 20mm AM6

39,50 €
In stock
RRP
43,00 €
-8% Discount
Stage6 R/T
Crankshaft Bearing Set Stage6 R/T C3 polymer 17mm + 20mm AM6
Article no.: S6-8031882/TN9
1

Crankshaft Bearing Set Stage6 R/T C3 polymer 17mm + 20mm AM6

39,50 €
In stock
RRP
43,00 €
-8% Discount
Stage6 R/T
Crankshaft Bearing Set Stage6 R/T C3 polymer cage AM6
Article no.: S6-8031880/TN9

Crankshaft Bearing Set Stage6 R/T C3 polymer cage AM6

35,00 €
In stock
RRP
43,00 €
-19% Discount
Sale
Stage6 R/T
Crankshaft Bearing Set Stage6 R/T C3 steel cage AM6
Article no.: S6-8031880/MET

Crankshaft Bearing Set Stage6 R/T C3 steel cage AM6

33,00 €
In stock
RRP
36,00 €
-8% Discount
Stage6 R/T
Crankshaft Bearing Set Stage6 R/T C3 steel 20mm AM6
Article no.: S6-8031881/MET

Crankshaft Bearing Set Stage6 R/T C3 steel 20mm AM6

35,00 €
In stock
RRP
38,00 €
-8% Discount
MotoForce Racing
Oil Seals crankshaft Motoforce Racing reinforced Viton® AM6
Article no.: MF96.00037
1

Oil Seals crankshaft Motoforce Racing reinforced Viton® AM6

12,50 €
In stock
RRP
14,00 €
-11% Discount
MotoForce Racing
Oil Seals crankshaft Motoforce Racing reinforced Viton® Derbi
Article no.: MF96.00036

Oil Seals crankshaft Motoforce Racing reinforced Viton® Derbi

12,50 €
In stock
RRP
14,00 €
-11% Discount
Polini
Small End Bearing Polini
Article no.: P280.00_SMALLENDBEARING
128

Small End Bearing Polini

from 8,40 €
In stock
24,00 €
-65% Discount
Derbi
Woodruff Key Derbi Euro 3 (D50B0)
Article no.: OE-DE847215
1

Woodruff Key Derbi Euro 3 (D50B0)

4,80 €
In stock
Yamaha
Key for counterbalance shaft Yamaha / MBK AM6
Article no.: OE-AM90282-04807

Key for counterbalance shaft Yamaha / MBK AM6

7,60 €
In stock
Yamaha
Crankshaft Key parallel 4x4x20 clutch-side AM6
Article no.: OE-AM90282-04806

Crankshaft Key parallel 4x4x20 clutch-side AM6

9,90 €
In stock
Yamaha
Small End Bearing 12x15x15mm original AM6
Article no.: OE-AM1TL-E1202-00

Small End Bearing 12x15x15mm original AM6

25,50 €
In stock
Bidalot
Small End Bearing 13x17x17.5mm Bidalot
Article no.: BID81200305
2

Small End Bearing 13x17x17.5mm Bidalot

16,00 €
In stock
Sale
Polini
Crankshaft Bearings Polini + Oil Seals Minarelli AM6
Article no.: P282.0003
29

Crankshaft Bearings Polini + Oil Seals Minarelli AM6

30,00 €
In stock
RRP
31,00 €
-3% Discount
Standard Parts
Crankshaft Pinion Gear AM6
Article no.: MF30.18823

Crankshaft Pinion Gear AM6

19,50 €
In stock
Naraku
Oil Seal Naraku FKM Premium 24x43x6mm
Article no.: NK103.96

Oil Seal Naraku FKM Premium 24x43x6mm

4,80 €
In stock
Rieju
Thrust Washer crankshaft d.16,9x24x8mm Rieju MRT
Article no.: OE-RIE0005.490.4663

Thrust Washer crankshaft d.16,9x24x8mm Rieju MRT

16,50 €
In stock
SKF
Bearing SKF 6203 C3 TN9 17x40x12mm polymer cage
Article no.: SKF6203TN9/C3

Bearing SKF 6203 C3 TN9 17x40x12mm polymer cage

9,30 €
In stock
2Fast
Small End Bearing 2Fast 14x17x17mm
Article no.: TFAST154

Small End Bearing 2Fast 14x17x17mm

18,00 €
In stock
2Fast
Small End Bearing 2Fast 12x17x16mm
Article no.: TFAST152

Small End Bearing 2Fast 12x17x16mm

19,00 €
In stock
2Fast
Crankshaft 2Fast 44,9mm stroke / 90mm conrod AM6
Article no.: TFAST085

Crankshaft 2Fast 44,9mm stroke / 90mm conrod AM6

451,00 €
In stock
Top Performances
Crankshaft Top Performances 44mm stroke Derbi Euro 3 / 4
Article no.: T9930210

Crankshaft Top Performances 44mm stroke Derbi Euro 3 / 4

193,00 €
In stock
RRP
267,00 €
-28% Discount
Italkit
Crankshaft Italkit 44mm stroke AM6
Article no.: IKCB4410R
1

Crankshaft Italkit 44mm stroke AM6

205,00 €
In stock
247,00 €
-17% Discount
Sale
Italkit
Crankshaft Italkit 44,9mm stroke Derbi Euro 3 / 4
Article no.: IKCB122452

Crankshaft Italkit 44,9mm stroke Derbi Euro 3 / 4

251,00 €
In stock
Bidalot
Crankshaft Bidalot Racing Factory 44,9mm stroke AM6
Article no.: BID12100866
1

Crankshaft Bidalot Racing Factory 44,9mm stroke AM6

269,00 €
In stock
Bidalot
Crankshaft Bidalot RF 48mm stroke / 95mm conrod Derbi Euro 3 / 4
Article no.: BID12100986

Crankshaft Bidalot RF 48mm stroke / 95mm conrod Derbi Euro 3 / 4

350,00 €
In stock
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123

Crankshafts for 50cc Gear bikes: Reliability and Performance

The cranktrain primarily includes the crankshaft, crankshaft bearings, and oil seals. In our online shop, this category also covers piston pin bearings (small end bearings) and balance shafts. Matching spare parts and accessories are also available.

The crankshaft and its components require special attention in terms of both performance and reliability.

All components are available for the most common models (Rieju MRT, Beta RR, Sherco SM, Derbi Senda, etc.) with Minarelli AM6 or Derbi engines.

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 displacement, it is also important to ensure that stroke and connecting rod length are compatible, as engine setup is precision work.

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

We offer crankshafts from well-known 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 on tuned bikes but also on original setups.

For tuned engines, we recommend using reinforced bearings.

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

small end Bearings and Accessories

The small end bearing (a 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 also considered part of the crankshaft accessories.

Important: Always make sure to choose the correct size! Some cylinder kits use larger piston pins than the original setup.

Accessories include replacement connecting rods, woodruff keys (standard or offset for ignition timing adjustment), drive gears, and balance shafts.

FAQ – Frequently Asked Questions about Crankshafts

→ Do I need to replace the crankshaft when increasing displacement?
Yes. The original crankshaft is generally not designed to handle the 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 advisable to leave it to a professional to avoid damage. If you choose to do it yourself, follow the workshop manual carefully or use detailed guides.
Note: The same special tools are required for replacing bearings and oil seals.

→ How can I tell if the bearings are worn?
Strong, unusual vibrations throughout the motorcycle are a typical sign. You may also hear grinding or rumbling noises while the engine is running.

→ How can I tell if the oil seals are defective?
Leaking oil seals allow false air to enter the engine, resulting in a lean air-fuel mixture. Typical symptoms include unstable idling, poor engine performance, and a whitish spark plug.

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