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Crankshaft

(127 products)
Moped Crankshafts Bearings and Oil Seals Small End Bearings Crankshaft Accessories
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Product type
Bearing open Connecting rod kit Crankshaft Crankshaft accessories Crankshaft bearing kit Engine case accessories Needle bearing Oil seal Wheel bearing set Woodruff key Nut Oil pump gear
Brand
2Fast Airsal Athena Doppler Jasil Malossi MotoForce MVT Naraku Polini RMS Schmitt SKF Stage6 Stage6 R/T Standard Parts Swiing Tomos Top Performances
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MotoForce
Oil Seal crankshaft 15x21x4.5mm MBK 51
Article no.: MF96.00060

Oil Seal crankshaft 15x21x4.5mm MBK 51

1,50 €
In stock
RRP
1,70 €
-12% Discount
MotoForce
Woodruff Key ignition Peugeot
Article no.: MF60.17518
2

Woodruff Key ignition Peugeot

3,20 €
In stock
RRP
3,70 €
-14% Discount
MotoForce
Small End Bearing reinforced
Article no.: MF33000_MF_AGUILLES
125

Small End Bearing reinforced

from 2,40 €
In stock
6,60 €
-64% Discount
MotoForce
Oil Seal crankshaft Peugeot 103
Article no.: MF96.00029

Oil Seal crankshaft Peugeot 103

2,90 €
In stock
MotoForce
Crankshaft Bearing Set Peugeot 103
Article no.: MF33.13201

Crankshaft Bearing Set Peugeot 103

15,50 €
In stock
Stage6
Small End Bearing HQ Stage6
Article no.: S6-8020_SIZES
198

Small End Bearing HQ Stage6

from 10,00 €
In stock
15,00 €
-33% Discount
Stage6
Crankshaft Stage6 MBK 51
Article no.: S6-8013000

Crankshaft Stage6 MBK 51

120,00 €
In stock
RRP
148,00 €
-19% Discount
Sale
Stage6
Oil Seals crankshaft Stage6 NBR Peugeot 103
Article no.: S6-8041320

Oil Seals crankshaft Stage6 NBR Peugeot 103

4,40 €
In stock
Stage6
Crankshaft Bearing Set Stage6 C3 polymer cage Peugeot 103
Article no.: S6-80332C3/TN9
1

Crankshaft Bearing Set Stage6 C3 polymer cage Peugeot 103

23,00 €
In stock
RRP
24,50 €
-6% Discount
Stage6
Crankshaft Bearing Set Stage6 C3 steel cage Peugeot 103
Article no.: S6-80332C3/MET

Crankshaft Bearing Set Stage6 C3 steel cage Peugeot 103

22,50 €
In stock
Stage6
Crankshaft Stage6 HPC Peugeot 103 SPX / RCX
Article no.: S6-8017401

Crankshaft Stage6 HPC Peugeot 103 SPX / RCX

116,00 €
In stock
RRP
148,00 €
-22% Discount
Sale
Stage6
Crankshaft Stage6 HPC Peugeot 103 SP (electronic)
Article no.: S6-8017400
5

Crankshaft Stage6 HPC Peugeot 103 SP (electronic)

114,00 €
In stock
RRP
148,00 €
-23% Discount
Sale
Malossi
Crankshaft Bearings Malossi Piaggio Ciao / Bravo
Article no.: M664678E

Crankshaft Bearings Malossi Piaggio Ciao / Bravo

19,00 €
In stock
RRP
22,00 €
-14% Discount
Sale
Malossi
Small End Bearing Malossi MBK 51 13x16x14mm
Article no.: M663276B
1

Small End Bearing Malossi MBK 51 13x16x14mm

14,00 €
In stock
Sale
Polini
Small End Bearing Polini Big Evolution 13x17x17,3mm Piaggio / Minarelli
Article no.: P280.0057

Small End Bearing Polini Big Evolution 13x17x17,3mm Piaggio / Minarelli

24,00 €
In stock
RRP
27,00 €
-11% Discount
Sale
Polini
Small end bearing Polini
Article no.: P280.00_SMALLENDBEARING
128

Small end bearing Polini

from 8,40 €
In stock
10,00 €
-16% Discount
Standard Parts
Woodruff Key ignition 3 x 3.7mm Minarelli AM6
Article no.: MF60.10001

Woodruff Key ignition 3 x 3.7mm Minarelli AM6

1,60 €
In stock
1,80 €
-11% 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
Standard Parts
Crankshaft Nut moped
Article no.: CGN487178

Crankshaft Nut moped

1,10 €
In stock
1,30 €
-15% Discount
Polini
Crankshaft Bearings Polini MBK 51
Article no.: P282.0010

Crankshaft Bearings Polini MBK 51

29,50 €
In stock
RRP
34,00 €
-13% Discount
Standard Parts
Woodruff Key 2x3.7mm Simson S51
Article no.: MOF-41336

Woodruff Key 2x3.7mm Simson S51

0,90 €
In stock
Standard Parts
Crankshaft Bearing Set with oil seals Puch Maxi E50 old engine
Article no.: MOF-44405

Crankshaft Bearing Set with oil seals Puch Maxi E50 old engine

7,40 €
In stock
8,40 €
-12% Discount
MVT
Oil Seal crankshaft MVT G2 / G3 / G4
Article no.: MVT-SPIG234

Oil Seal crankshaft MVT G2 / G3 / G4

8,40 €
In stock
RRP
9,90 €
-15% Discount
Polini
Crankshaft Bearings and Oil Seals Polini Piaggio Ciao
Article no.: P282.0008

Crankshaft Bearings and Oil Seals Polini Piaggio Ciao

14,00 €
In stock
Doppler
Crankshaft Oil Seals Doppler FKM Peugeot 103
Article no.: CGN516945

Crankshaft Oil Seals Doppler FKM Peugeot 103

7,90 €
In stock
10,00 €
-21% Discount
Doppler
Crankshaft Oil Seals Doppler FKM MBK 51
Article no.: CGN516947

Crankshaft Oil Seals Doppler FKM MBK 51

7,90 €
In stock
9,70 €
-19% Discount
Standard Parts
Crankshaft Oil Seal nitrile Peugeot 103 Fox
Article no.: CGN526222

Crankshaft Oil Seal nitrile Peugeot 103 Fox

4,80 €
In stock
Standard Parts
Woodruff Key flywheel Zündapp / 3x3,7x9,6
Article no.: SP-8969

Woodruff Key flywheel Zündapp / 3x3,7x9,6

0,80 €
In stock
Standard Parts
Crankshaft Tomos A3 / A35 / A55
Article no.: SP-94251

Crankshaft Tomos A3 / A35 / A55

79,50 €
In stock
Naraku
Oil Seal Naraku FKM Premium 24x43x6mm
Article no.: NK103.96

Oil Seal Naraku FKM Premium 24x43x6mm

4,80 €
In stock
Naraku
Oil Seal Naraku FKM Premium 22x38x6mm
Article no.: NK103.91

Oil Seal Naraku FKM Premium 22x38x6mm

5,40 €
In stock
Naraku
Oil Seal Naraku FKM Premium 17x30x6mm
Article no.: NK103.47

Oil Seal Naraku FKM Premium 17x30x6mm

5,80 €
In stock
Standard Parts
Wheel Bearing Kit front wheel reinforced Piaggio Ciao
Article no.: IP42153

Wheel Bearing Kit front wheel reinforced Piaggio Ciao

27,00 €
In stock
Polini
Crankshaft Bearings Polini Evolution Piaggio Ciao (6202.C4)
Article no.: P280.0040
1

Crankshaft Bearings Polini Evolution Piaggio Ciao (6202.C4)

6,60 €
In stock
Polini
Crankshaft Bearings Polini Peugeot 103
Article no.: P280.0020
1

Crankshaft Bearings Polini Peugeot 103

9,30 €
In stock
RRP
11,00 €
-15% Discount
Polini
Small End Bearing Polini P.R.E. 2 Piaggio Zip SP LC
Article no.: P280.0060

Small End Bearing Polini P.R.E. 2 Piaggio Zip SP LC

12,00 €
In stock
RRP
14,00 €
-14% Discount
Standard Parts
Support Plate for crankcase oil seal Peugeot 103
Article no.: L-SP163932

Support Plate for crankcase oil seal Peugeot 103

4,10 €
In stock
Standard Parts
Crankshaft Bearings and Oil Seals Tomos A35
Article no.: MF33.13900

Crankshaft Bearings and Oil Seals Tomos A35

15,00 €
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
Standard Parts
Crankshaft Oil Thrower Spacer Disc 39x47x1mm Simson
Article no.: MOF-41513

Crankshaft Oil Thrower Spacer Disc 39x47x1mm Simson

2,20 €
In stock
Standard Parts
Crankshaft Oil Thrower Spacer Disc 39x47x0.2mm Simson
Article no.: MOF-41457

Crankshaft Oil Thrower Spacer Disc 39x47x0.2mm Simson

2,00 €
In stock
Standard Parts
Crankshaft Oil Thrower Spacer Disc 39x47x0.3mm Simson
Article no.: MOF-41374

Crankshaft Oil Thrower Spacer Disc 39x47x0.3mm Simson

2,00 €
In stock
Standard Parts
Crankshaft Puch Mv50 3V / 4V
Article no.: MOF-39326

Crankshaft Puch Mv50 3V / 4V

49,00 €
In stock
51,00 €
-4% Discount
Standard Parts
Crankshaft Bearing E20 brass cage Puch Maxi 20x47x12mm (x1)
Article no.: LAG.E20

Crankshaft Bearing E20 brass cage Puch Maxi 20x47x12mm (x1)

24,00 €
In stock
2Fast
Small End Bearing 2Fast 14x17x17mm
Article no.: TFAST154

Small End Bearing 2Fast 14x17x17mm

19,00 €
In stock
Sale
Polini
Crankshaft Polini Evolution 12mm piston pin Piaggio Ciao
Article no.: P210.0074

Crankshaft Polini Evolution 12mm piston pin Piaggio Ciao

238,00 €
In stock
RRP
268,00 €
-11% Discount
Malossi
Small End Bearing Malossi MHR
Article no.: Malossi-Aguilles-renforcee
56

Small End Bearing Malossi MHR

from 12,00 €
In stock
18,00 €
-33% Discount
Malossi
Crankshaft Malossi RHQ Piaggio Ciao for MP-One stroke 43mm
Article no.: M5318739

Crankshaft Malossi RHQ Piaggio Ciao for MP-One stroke 43mm

268,00 €
In stock
RRP
300,00 €
-11% Discount
Malossi
Crankshaft Malossi RHQ Piaggio Ciao pin 12mm - stroke 43mm
Article no.: M5319434

Crankshaft Malossi RHQ Piaggio Ciao pin 12mm - stroke 43mm

274,00 €
In stock
RRP
310,00 €
-12% Discount
Sale
Malossi
Crankshaft Malossi RHQ Piaggio Ciao pin 10mm - stroke 43mm
Article no.: M5319440

Crankshaft Malossi RHQ Piaggio Ciao pin 10mm - stroke 43mm

261,00 €
In stock
RRP
300,00 €
-13% Discount
Sale
Malossi
Crankshaft Malossi axle 12mm Piaggio Ciao
Article no.: M531802

Crankshaft Malossi axle 12mm Piaggio Ciao

251,00 €
In stock
RRP
310,00 €
-19% Discount
Malossi
Needle Bearing Malossi Piaggio Ciao 10x13x14.5mm
Article no.: M663974B

Needle Bearing Malossi Piaggio Ciao 10x13x14.5mm

11,00 €
In stock
Polini
Crankshaft Polini Peugeot 103 SP / MV (e-starter)
Article no.: P210.0013

Crankshaft Polini Peugeot 103 SP / MV (e-starter)

240,00 €
In stock
RRP
275,00 €
-13% Discount
Doppler
Small End Bearing Doppler reinforced 13x16x14 MBK 51
Article no.: CGN461981

Small End Bearing Doppler reinforced 13x16x14 MBK 51

10,00 €
In stock
Doppler
Crankshaft Doppler Endurance Peugeot 103 SPX / RCX
Article no.: CGN441285
2

Crankshaft Doppler Endurance Peugeot 103 SPX / RCX

135,00 €
In stock
144,00 €
-6% Discount
Doppler
Crankshaft Doppler Endurance Peugeot 103 SP / MV (electronic)
Article no.: CGN441283
3

Crankshaft Doppler Endurance Peugeot 103 SP / MV (electronic)

135,00 €
In stock
144,00 €
-6% Discount
SKF
Crankshaft Bearing Set SKF MBK 51
Article no.: CGN323821

Crankshaft Bearing Set SKF MBK 51

27,00 €
In stock
Doppler
Crankshaft Doppler Endurance MBK 51 (kickstart)
Article no.: CGN441286

Crankshaft Doppler Endurance MBK 51 (kickstart)

135,00 €
In stock
144,00 €
-6% Discount
MVT
Crankshaft för MVT G4 case stroke 43mm
Article no.: MVT-VI42

Crankshaft för MVT G4 case stroke 43mm

183,00 €
In stock
RRP
216,00 €
-15% Discount
MVT
Crankshaft MBK 51 MVT SC stroke 41,8mm (G1 / G2A)
Article no.: MVT-VI40

Crankshaft MBK 51 MVT SC stroke 41,8mm (G1 / G2A)

204,00 €
In stock
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123

Moped crankshaft - complete guide

The crankshaft is an essential component of every engine. Its task is to convert the linear motion of the piston into a smooth rotary motion and thus transfer the power to the wheel. It is not just a shaft: it is built to withstand combustion explosions, constant friction, high temperatures and extreme loads that would endanger other components.

If the crankshaft breaks, the engine comes to a standstill - and the consequential damage can be considerable. It is the central axis of all engine movements: Piston, ignition, gearbox, water pump... Every revolution requires precise balancing and accurate assembly of the rods, connecting rods and bearings. Any inaccuracy or misalignment causes vibrations that can result in a defect.

In our online store, you will find standard crankshafts (OEM) and racing crankshafts designed for higher loads. With a robust, properly designed crankshaft, the engine can develop its full potential - with an excellent compromise between torque and revving pleasure and a long service life.

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

→ Thanks to our explodedviews, you can easily identify the part you need.

Vintage vs. modern 50cc crankshafts: What has changed?

The crankshafts of mopeds and mopeds from the 60s to 90s were developed according to a completely different philosophy to that of modern 50cc motorcycles or scooters. Back then, the main focus of these 2-stroke crankshafts was on simplicity and reparability. Cast iron or simple forged steel constructions, dismountable construction for easier repairs, premix lubrication... The goal was clear: robust build, low costs and ensure that any reasonably competent mechanic can repair the part with basic tools. The component had to be durable and run for many kilometers without maintenance. Performance was not the priority; balancing and pre-compression were functional, but rather rudimentary.

Today, the picture has changed fundamentally. Today's crankshafts are precision forged from high-strength alloys and surface-treated using processes such as nitriding or induction hardening to maximize durability. Thanks to high-precision machining with minimal tolerances, many parts are machined directly from solid and thus achieve extremely high rigidity. The result is perfect dynamic balancing that extremely reduces or even eliminates vibrations - consistently designed for efficiency and performance.

You can find both types of crankshaft in our online store. If you are aiming for a true-to-original restoration and rebuilding your moped according to factory specifications, you can preserve the authentic character and mechanical simplicity. If, on the other hand, you want to tune the engine, you can turn your moped or moped into a little racer with modern, reinforced racing crankshafts. In addition, all other components are available as complete kits to achieve maximum performance (cylinders, exhausts, ignitions, variators etc...).

Crankshafts for classic mopeds: features, advantages and requirements

Not every crankshaft is the same. Depending on the engine type, displacement and intended use, there are different variants that offer the optimum balance of stability, performance and price. In this section, the most important features of each variant can be easily identified to help you make the right decision:

✅ Original crankshaft

⇒ APPLICATION: Standard spare part, daily use

⇒ FEATURES:

  • Webs: open design / half cheek
  • Stroke: standard
  • Connecting rod: Standard
  • Small end bearing: Standard
  • Balancing: basic
  • Performance: standard

⇒ ADVANTAGES: Inexpensive, plug-and-play assembly, corresponds to the series specifications.

⇒ REQUIREMENTS: Always replace seals and bearings during assembly.

⇒ RECOMMENDED: Motoforce, Standard Parts.

✅ Sport and racing crankshaft

⇒ APPLICATION: Suitable for improved road performance through to racing.

⇒ FEATURES:

  • Reinforced crankshaft
  • Webs: mostly full circle, more solid materials
  • Stroke: standard or long stroke
  • Connecting rod: reinforced
  • Piston pin bearings: higher quality
  • Balancing: optimized
  • Performance: improved

⇒ ADVANTAGES: better compression and increased reliability under high loads.

⇒ REQUIREMENTS: Sport or racing cylinder, matching exhaust, matching carburetor tuning, high-quality bearings.

⇒ RECOMMENDED: Stage6 HPC, Malossi, Polini, Doppler, Schmitt...

Extended range: crankshafts, spare parts and complete engine kits

The range is wide: from standard parts to racing parts, as a kit or individually.

If the displacement is increased to 65cc, 75cc or over 100cc, the standard crankshaft is no longer sufficient. The solution is to upgrade to a reinforced or racing model that can safely handle the increase in torque and high engine speeds. Only in this way can the potential of a powerful cylinder or exhaust be fully exploited and the energy transferred effectively and safely.

We offer the complete Racing and High End Racing product lines from Stage6, Malossi, Polini, Athena, MVT, Jasil, Schmitt, Swiing and other manufacturers who are renowned for quality and performance.

Why replace the crankshaft?

Crankshafts work in one of the toughest environments in the engine: extreme temperatures, constant mechanical stress... Over time, wear adds up and failure becomes inevitable. When it does, the damage is rarely limited. A defective crankshaft can damage cylinders, pistons and even the engine housing...

It is therefore advisable to replace the crankshaft at high mileage or when upgrading to a more powerful cylinder.

Recommendations for installing a crankshaft

  • Always fit new bearings and oil seals: reusing old parts saves money in the wrong place and leads to premature failure
  • Ensure perfect centering and balancing: incorrect assembly causes vibrations, destroys bearings and can cause the engine housing to crack
  • If you lack experience, it is better to have it fitted by a qualified specialist workshop

FAQ - Frequently asked questions about crankshafts

⇒ Does the crankshaft have to be replaced when installing a new cylinder?

If the displacement or power is increased: yes, absolutely. The standard crankshaft is not designed to cope with the higher torque requirements and the higher RPMs. It must be replaced with a suitably reinforced model. Otherwise there is a risk of considerable damage.

⇒ Can the crankshaft be replaced without help?

This is of course doable, but working on the crankshaft requires special tools and experience in dealing with tolerances. A single mistake during reassembly can lead to catastrophic engine damage. If you are not absolutely sure, it is better to call a professional. If you are carrying out the work yourself, strictly follow the manufacturer's workshop manual and refer to the instructions for installing and removing the crankshaft for detailed steps.

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