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Crankshaft

(129 products)
50cc Bike Crankshafts Bearings and Oil Seals Small End Bearings Crankshaft Accessories
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Product type
Bearing & gasket tools Bearing open Clutch gear Connecting rod kit Crankshaft Crankshaft bearing kit Needle bearing Oil seal Oil seal kit Washer Woodruff key Counterbalance shaft
Brand
2Fast Airsal Barikit Bidalot Conti Derbi Doppler Italkit Jasil Malossi Metrakit MotoForce MotoForce Racing MVT Naraku Parmakit Polini Rieju RMS SKF Stage6 Stage6 R/T Standard Parts Top Performances Voca Racing Yamaha
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Bidalot
Crankshaft Bidalot RF50WR 39,7mm stroke / 85mm conrod AM6
Article no.: BID12100568

Crankshaft Bidalot RF50WR 39,7mm stroke / 85mm conrod AM6

257,00 €
In stock
Sale
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

214,00 €
In stock
Sale
Italkit
Crankshaft Italkit 44,9mm stroke Derbi Euro 3 / 4
Article no.: IKCB122452

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

214,00 €
In stock
Sale
Italkit
Crankshaft Italkit 44,9mm stroke Derbi Euro 2
Article no.: IKCB121452

Crankshaft Italkit 44,9mm stroke Derbi Euro 2

214,00 €
In stock
Sale
Bidalot
Crankshaft Bidalot RF50WR 39,7mm stroke / 85mm conrod Derbi Euro 2
Article no.: BID12100578

Crankshaft Bidalot RF50WR 39,7mm stroke / 85mm conrod Derbi Euro 2

257,00 €
In stock
RRP
280,00 €
-8% Discount
Sale
Bidalot
Crankshaft Bidalot Racing Factory 44,9mm stroke / 90mm conrod Derbi Euro 3 / 4
Article no.: BID12100886

Crankshaft Bidalot Racing Factory 44,9mm stroke / 90mm conrod Derbi Euro 3 / 4

257,00 €
In stock
RRP
280,00 €
-8% Discount
Sale
2Fast
Crankshaft 2Fast 47mm stroke / 95mm conrod Derbi Euro 3 / 4
Article no.: TFAST053

Crankshaft 2Fast 47mm stroke / 95mm conrod Derbi Euro 3 / 4

461,00 €
In stock
Sale
Top Performances
Crankshaft AM6 TPR Factory 100cc stroke 47mm / conrod 98mm
Article no.: T99AL47AM00

Crankshaft AM6 TPR Factory 100cc stroke 47mm / conrod 98mm

647,00 €
In stock
Top Performances
Crankshaft Top Performances 44mm stroke AM6
Article no.: T9920410
11

Crankshaft Top Performances 44mm stroke AM6

178,00 €
In stock
RRP
265,00 €
-33% Discount
Sale
Malossi
Crankshaft Bearings Malossi 6204 C3H polymer cage 20x47x14mm
Article no.: M6611566E
14

Crankshaft Bearings Malossi 6204 C3H polymer cage 20x47x14mm

26,50 €
In stock
Airsal
Crankshaft Airsal Racing Xtrem 45mm stroke Derbi Euro 3 / 4
Article no.: C31087550
4

Crankshaft Airsal Racing Xtrem 45mm stroke Derbi Euro 3 / 4

232,00 €
In stock
RRP
242,00 €
-4% Discount
Airsal
Crankshaft Airsal Racing Xtrem 45mm stroke Derbi Euro 2
Article no.: C31087650
3

Crankshaft Airsal Racing Xtrem 45mm stroke Derbi Euro 2

211,00 €
In stock
RRP
242,00 €
-13% Discount
Airsal
Crankshaft Airsal Racing Xtrem 45mm stroke AM6
Article no.: C31137350
2

Crankshaft Airsal Racing Xtrem 45mm stroke AM6

227,00 €
In stock
Malossi
Small End Bearing Malossi MHR
Article no.: Malossi-Aguilles-renforcee
56

Small End Bearing Malossi MHR

from 8,70 €
In stock
Malossi
Crankshaft Malossi MHR Team 47mm stroke Derbi
Article no.: M5318895

Crankshaft Malossi MHR Team 47mm stroke Derbi

726,00 €
In stock
RRP
808,00 €
-10% Discount
MVT
Crankshaft MVT S-Race Derbi Euro 3 / 4
Article no.: MVT-VI13
8

Crankshaft MVT S-Race Derbi Euro 3 / 4

100,00 €
In stock
RRP
118,00 €
-15% Discount
MotoForce Racing
Crankshaft stroke 44 mm MotoForce Racing AM6
Article no.: MF30.11003

Crankshaft stroke 44 mm MotoForce Racing AM6

119,00 €
In stock
New
Parmakit
Crankshaft stroke 44mm Parmakit Minarelli P6
Article no.: PM53488.14

Crankshaft stroke 44mm Parmakit Minarelli P6

297,00 €
In stock
Parmakit
Crankshaft stroke 42mm Parmakit Minarelli P6
Article no.: PM53480.14

Crankshaft stroke 42mm Parmakit Minarelli P6

320,00 €
In stock
MVT
Crankshaft MVT SC 44,8mm stroke Derbi Euro 3 / 4
Article no.: MVT-VI32

Crankshaft MVT SC 44,8mm stroke Derbi Euro 3 / 4

267,00 €
In stock
RRP
287,00 €
-7% Discount
Sale
MVT
Crankshaft MVT SC 44,8mm stroke / 90mm conrod AM6
Article no.: MVT-VI31

Crankshaft MVT SC 44,8mm stroke / 90mm conrod AM6

251,00 €
In stock
RRP
287,00 €
-13% Discount
Sale
Doppler
Crankshaft Doppler Endurance Derbi Euro 2
Article no.: CGN367238
11

Crankshaft Doppler Endurance Derbi Euro 2

152,00 €
In stock
RRP
168,00 €
-10% Discount
Sale
Doppler
Crankshaft Doppler Endurance AM6
Article no.: CGN367223
31

Crankshaft Doppler Endurance AM6

153,00 €
In stock
RRP
168,00 €
-9% Discount
Sale
Conti
Crankshaft Conti CHR Derbi Euro 3 / 4
Article no.: CGN518746

Crankshaft Conti CHR Derbi Euro 3 / 4

174,00 €
In stock
Sale
Conti
Crankshaft Conti CHR AM6
Article no.: CGN518745

Crankshaft Conti CHR AM6

188,00 €
In stock
197,00 €
-5% Discount
Sale
Voca Racing
Crankshaft Voca HQ Racing 43mm stroke Yamaha DT50
Article no.: VCR-RD70130.43.HQ

Crankshaft Voca HQ Racing 43mm stroke Yamaha DT50

175,00 €
In stock
RRP
215,00 €
-19% Discount
Doppler
Crankshaft Doppler Endurance Derbi Euro 3 / 4
Article no.: CGN468210
21

Crankshaft Doppler Endurance Derbi Euro 3 / 4

153,00 €
In stock
RRP
168,00 €
-9% Discount
Sale
Polini
Crankshaft Polini For Race Derbi Euro 3 / 4
Article no.: P210.0053

Crankshaft Polini For Race Derbi Euro 3 / 4

184,00 €
In stock
RRP
217,00 €
-15% Discount
Barikit
Crankshaft Barikit Racing Derbi Euro 2 (EBS)
Article no.: BAR-CIG-44
4

Crankshaft Barikit Racing Derbi Euro 2 (EBS)

126,00 €
In stock
Barikit
Crankshaft Barikit Racing Derbi Euro 2
Article no.: BAR-CIG-24
16

Crankshaft Barikit Racing Derbi Euro 2

122,00 €
In stock
123,00 €
-1% Discount
Sale
Barikit
Crankshaft Barikit Racing AM6
Article no.: BAR-CIG-29
21

Crankshaft Barikit Racing AM6

122,00 €
In stock
125,00 €
-2% Discount
Sale
Barikit
Crankshaft Barikit Racing Derbi Euro 3 (D50B0)
Article no.: BAR-CIG-60
24

Crankshaft Barikit Racing Derbi Euro 3 (D50B0)

144,00 €
In stock
RRP
153,00 €
-6% Discount
Sale
MotoForce Racing
Crankshaft Motoforce Racing Derbi Euro 2
Article no.: MF30.12502
7

Crankshaft Motoforce Racing Derbi Euro 2

110,00 €
In stock
RRP
116,00 €
-5% Discount
MotoForce Racing
Crankshaft Motoforce Racing AM6
Article no.: MF30.11002
18

Crankshaft Motoforce Racing AM6

105,00 €
In stock
RRP
113,00 €
-7% Discount
Doppler
Small End Bearing Doppler 12x16x15
Article no.: CGN461989

Small End Bearing Doppler 12x16x15

10,00 €
In stock
Standard Parts
Crankshaft Oil Seal 15x24x5mm Piaggio Ciao PX (x1)
Article no.: CGN3268

Crankshaft Oil Seal 15x24x5mm Piaggio Ciao PX (x1)

4,70 €
In stock
Metrakit
Crankshaft Metrakit Handmade Derbi Euro 3 / 4
Article no.: MK850D2512
14

Crankshaft Metrakit Handmade Derbi Euro 3 / 4

86,00 €
In stock
RRP
102,00 €
-16% Discount
MotoForce
Ignition Woodruff Key 2.5x3.7mm Derbi
Article no.: MF60.19315

Ignition Woodruff Key 2.5x3.7mm Derbi

1,40 €
In stock soon
MotoForce
Counterbalance Shaft AM6
Article no.: MF60.18813

Counterbalance Shaft AM6

19,00 €
In stock soon
RRP
22,00 €
-14% 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

217,00 €
In stock soon
RRP
228,00 €
-5% Discount
Stage6
Crankshaft Stage6 HPC MK2 AM6
Article no.: S6-8018801
8

Crankshaft Stage6 HPC MK2 AM6

228,00 €
In stock soon
RRP
239,00 €
-5% Discount
Stage6
Crankshaft Stage6 HPC 44mm stroke AM6
Article no.: S6-8018809

Crankshaft Stage6 HPC 44mm stroke AM6

191,00 €
In stock soon
RRP
212,00 €
-10% Discount
Stage6 R/T
Crankshaft Stage6 R/T AM6
Article no.: S6-7918801

Crankshaft Stage6 R/T AM6

243,00 €
In stock soon
RRP
269,00 €
-10% Discount
RMS
Bearing SKF 6203-C5 TN9 - 17x40x12mm Vespa Primavera
Article no.: R100200080

Bearing SKF 6203-C5 TN9 - 17x40x12mm Vespa Primavera

8,90 €
In stock soon
Yamaha
Ignition Woodruff Key AM6
Article no.: OE-AM1TL-E1545-00

Ignition Woodruff Key AM6

3,00 €
In stock soon
SKF
Needle Bearing SKF HK1010 10x14x10mm AM6
Article no.: SP-215224

Needle Bearing SKF HK1010 10x14x10mm AM6

4,90 €
In stock soon
Standard Parts
Crankshaft Pinion Gear AM6
Article no.: MF30.18823

Crankshaft Pinion Gear AM6

19,50 €
In stock soon
2Fast
Crankshaft 2Fast 44,9mm stroke / 90mm conrod AM6
Article no.: TFAST085

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

460,00 €
In stock soon
Bidalot
Crankshaft Bidalot RF50WR 39,7mm stroke / 85mm conrod Derbi Euro 3 / 4
Article no.: BID12100588

Crankshaft Bidalot RF50WR 39,7mm stroke / 85mm conrod Derbi Euro 3 / 4

267,00 €
In stock soon
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 soon
Bidalot
Crankshaft Bidalot Racing Factory 48mm stroke / 95mm conrod Derbi Euro 3 / 4
Article no.: BID12100986

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

350,00 €
In stock soon
Bidalot
Crankshaft Bidalot Racing Factory 48mm stroke / 95mm conrod AM6
Article no.: BID12100966

Crankshaft Bidalot Racing Factory 48mm stroke / 95mm conrod AM6

375,00 €
In stock soon
2Fast
Crankshaft 2Fast 47mm stroke / 95mm conrod AM6
Article no.: TFAST051

Crankshaft 2Fast 47mm stroke / 95mm conrod AM6

465,00 €
In stock soon
MVT
Crankshaft MVT S-Race stroke 43mm stroke AM6
Article no.: MVT-VI17

Crankshaft MVT S-Race stroke 43mm stroke AM6

129,00 €
In stock soon
RRP
152,00 €
-15% Discount
2Fast
Connecting Rod 2Fast 95mm pin 18 x 45mm Derbi
Article no.: TFAST141

Connecting Rod 2Fast 95mm pin 18 x 45mm Derbi

201,00 €
Currently not in stock
Polini
Crankshaft Bearing Set Polini Derbi
Article no.: P282.0004
69

Crankshaft Bearing Set Polini Derbi

25,00 €
Currently not in stock
RRP
29,00 €
-14% Discount
Polini
Crankshaft Oil Seals Polini Evolution Viton® Derbi
Article no.: P285.0004
8

Crankshaft Oil Seals Polini Evolution Viton® Derbi

16,50 €
Currently not in stock
RRP
18,00 €
-8% Discount
Naraku
Oil Seal Naraku FKM Premium 24x43x6mm
Article no.: NK103.96

Oil Seal Naraku FKM Premium 24x43x6mm

4,80 €
Currently not in stock
Naraku
Oil Seal Naraku FKM Premium 22x38x6mm
Article no.: NK103.91

Oil Seal Naraku FKM Premium 22x38x6mm

5,40 €
Currently not in stock
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123

50cc bike Crankshafts: performance and reliability with every revolution

The crankshaft is a central component of every engine. It converts the linear movement of the piston into a smooth rotary movement and transmits the power to the rear wheel via the transmission / CVT. In doing so, it is exposed to extreme loads: combustion pressure, permanent friction, high temperatures and high speeds. A crankshaft is not a simple component, but is precisely designed for these conditions.

If the crankshaft fails, the engine comes to a standstill. It is the central axis of all engine movement: Piston, CVT and gearbox. Each revolution requires a perfect balance between the crank webs, connecting rods and bearings. If this balance is lost, vibrations occur, causing rough engine operation and potentially severe engine damage.

A reinforced crankshaft or racing crankshaft not only increases performance, but also determines the durability and reliability of the engine, especially on tuned Superemotos / Enduro Bikes.

In our online store you will find OEM crankshafts as replacement for the stock crankshaft as well as racing crankshafts for higher loads. With a reliable crankshaft, the engine can develop its full potential and offers a powerful, more precise riding experience that is up to any challenge.

And if you want to repair the crankshaft without spending too much money, you can find bearings, oil seals, crankshaft bearings, connecting rods, spacers, bushings, piston pins and much more in our spare parts catalog.

→ Thanks to our exploded views, you can find the right part quickly and easily.

Crankshaft types for 50cc motorcycles: features, advantages and requirements

Not all crankshafts are the same. Depending on the engine type, displacement and intended use, there are different product lines that offer the ideal balance between durability, performance and price. Below is a list with the most important features of the different types to help you make the right choice:

✅ OEM / Original crankshaft

→ APPLICATION: OEM quality replacement

→ FEATURES:

  • Stroke: Original
  • Connecting rod: Original
  • Small end bearing: Standard
  • Balancing: Standard
  • Performance: Standard

→ ADVANTAGES: Inexpensive, easy to install (plug & play)

→ REQUIREMENTS: Replacement of seals and bearings is recommended.

→ RECOMMENDED Crankshafts: Motoforce, OEM

✅ Sport & Racing crankshaft

→ APPLICATION: Suitable for everyday use through to sports / racing applications.

→ FEATURES:

  • Reinforced crankshaft
  • Crank webs: Full circle, reinforced
  • Stroke: original - 44 mm
  • Connecting rod: mostly original
  • Smal end bearing: reinforced
  • Balancing: optimized
  • Performance: improved

→ ADVANTAGES: Higher reliability, better pre-compression, optimized torque

→ REQUIREMENTS: Use suitable bearings. If stroke or rod length differs from stock, crankcase modification is required.

→ RECOMMENDED CRANKSHAFTS:

✅ High end crankshaft

→ APPLICATION: Exclusively for racing.

→ FEATURES:

  • Ultra-reinforced crankshaft
  • Crank webs: Full circle, high-strength materials
  • Stroke: up to 50 mm
  • Connecting rod: forged and reinforced
  • Small end bearing: reinforced HQ (often silver-plated)
  • Balancing: high-precision with counterweights for maximum performance and smooth running
  • Performance: maximum torque, power and stability

→ ADVANTAGES: Outstanding durability, linear power delivery and maximum performance.

→ REQUIREMENTS: Crankcase machining (depending on model), high-quality components and bearings, professional installation required.

→ RECOMMENDED CURVES: Stage6 R/T, 2Fast, Ottopuntouno, Polini PR

Huge selection: Crankshafts, spare parts and complete engine kits

In our store you will find everything from original spare parts (Rieju, Derbi) and inexpensive replicas such as Motoforce to exclusive components for 50cc tuning engines.

If the displacement is increased to 70, 88 or even 100cc, the standard crankshaft is no longer sufficient. The solution is to replace it with a reinforced or racing crankshaft that can reliably withstand higher torque and speeds. Without a suitable crankshaft, the entire setup will not function optimally.

We stock racing and high-end shafts from Stage6 R/T, Malossi, Polini, 2Fast, Metrakit, Italkit, Airsal,Top Performances and many other renowned brands.

Why replace the crankshaft?

The crankshaft works under extreme conditions: high temperatures, continuous loads and not always perfect lubrication. Over time or with a lack of maintenance, it wears out and can fail. In this case, the damage is usually not limited to the crankshaft - cylinders and other important components can also be affected. Timely replacement of the crankshaft is ultimately much more cost-effective than a complete engine repair.

On 50cc motorcycles with Minarelli AM6 or Derbi Euro 2/3 engines, the standard crankshafts are robust. For these kinds of bikes, crankshafts are usually upgraded by a reinforced or racing crankshaft for 70, 80 or 90cc cylinders to increase performance.

Crankshaft installation tips

  • Always use new bearings and seals.
  • Ensure perfect centering → avoids vibrations and breakages.
  • VERY IMPORTANT: If you have no experience, leave the installation to a specialist.

Maintenance and inspection of crankshafts

Each type of crankshaft requires specific maintenance to ensure reliability and longevity. Regular inspections and the timely replacement of bearings and seals are essential. Pay attention to unusual noises or vibrations - these are often the first signs of wear. If the main bearings make noises or the engine runs uneven, the crankshaft should be replaced as soon as possible to avoid consequential damage to the cylinder or engine failure.

FAQ - Frequently asked questions about the crankshaft

→ Do I have to replace the crankshaft when increasing displacement? Yes. The stock crankshaft cannot reliably handle higher torque and increased RPM. A reinforced or racing crankshaft is required.

→ Can I replace the crankshaft myself? Installation is tricky and requires special tools. Without experience, this should be left to a specialist. If you want to do it yourself, we recommend following the workshop manual or consulting our crankshaft assembly / disassembly instructions.

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