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Crankshaft

(200 products)
Scooter Crankshafts Bearings and Oil Seals Small End Bearings Crankshaft Accessories
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Product type
Bearing & gasket tools Bearing open Connecting rod kit Crankcase Crankshaft Crankshaft accessories Crankshaft bearing kit Needle bearing Oil seal Oil seal kit Woodruff key
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2Fast Airsal Athena Bidalot Doppler Jasil Malossi MotoForce MotoForce Racing Naraku Ottopuntouno Peugeot Piaggio Polini RMS 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
Yamaha
Crankshaft MBK Booster / Yamaha BW's after 2004
Article no.: OE-MAL5WWE14000200

Crankshaft MBK Booster / Yamaha BW's after 2004

268,00 €
Currently not in stock
Polini
Small End Bearing Polini 14x17x17mm
Article no.: P280.0077

Small End Bearing Polini 14x17x17mm

29,00 €
Currently not in stock
RRP
34,00 €
-15% Discount
Peugeot
Crankcase left side Peugeot 4-stroke Django / Kisbee after '18
Article no.: OE-PEU803896

Crankcase left side Peugeot 4-stroke Django / Kisbee 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
2Fast
Connecting Rod 2Fast 90mm pin 18 x 46mm Passion Minarelli
Article no.: TFAST138

Connecting Rod 2Fast 90mm pin 18 x 46mm Passion Minarelli

201,00 €
Currently not in stock
2Fast
Connecting Rod 2Fast 90mm pin 18 x 40mm Piaggio
Article no.: TFAST137

Connecting Rod 2Fast 90mm pin 18 x 40mm Piaggio

201,00 €
Currently not in stock
2Fast
Connecting Rod 2Fast 85mm pin 18 x 40mm Piaggio
Article no.: TFAST133

Connecting Rod 2Fast 85mm pin 18 x 40mm Piaggio

201,00 €
Currently not in stock
2Fast
Connecting Rod 2Fast Passion 100mm pin 18 x 46mm Minarelli
Article no.: TFAST131

Connecting Rod 2Fast Passion 100mm pin 18 x 46mm Minarelli

224,00 €
Currently not in stock
2Fast
Connecting Rod 2Fast Passion 100mm pin 20 x 46mm Minarelli
Article no.: TFAST127

Connecting Rod 2Fast Passion 100mm pin 20 x 46mm Minarelli

249,00 €
Currently not in stock
2Fast
Connecting Rod 2Fast 100mm pin 20 x 41mm Piaggio
Article no.: TFAST126

Connecting Rod 2Fast 100mm pin 20 x 41mm Piaggio

224,00 €
Currently not in stock
Polini
Crankshaft Polini PRE4 100cc Piaggio / Minarelli
Article no.: P210.0086

Crankshaft Polini PRE4 100cc Piaggio / Minarelli

612,00 €
Currently not in stock
RRP
719,00 €
-15% Discount
Polini
Crankshaft Polini PRE4 70cc Piaggio / Minarelli
Article no.: P210.0085

Crankshaft Polini PRE4 70cc Piaggio / Minarelli

607,00 €
Currently not in stock
RRP
714,00 €
-15% Discount
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
Polini
Crankshaft Polini 10mm KoBo Minarelli liegend
Article no.: P210.0084

Crankshaft Polini 10mm KoBo Minarelli liegend

147,00 €
Currently not in stock
RRP
173,00 €
-15% Discount
Polini
Crankshaft Polini For Race Piaggio
Article no.: P210.0082

Crankshaft Polini For Race Piaggio

142,00 €
Currently not in stock
RRP
167,00 €
-15% Discount
Polini
Crankshaft Polini For Race 10mm pin Minarelli vertical
Article no.: P210.0049

Crankshaft Polini For Race 10mm pin Minarelli vertical

145,00 €
Currently not in stock
RRP
167,00 €
-13% Discount
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scooter Crankshafts: performance and reliability with every revolution

The crankshaft is a core component of every scooter engine. Its job is to convert the linear motion of the piston into smooth rotational movement and transmit power through the transmission to the rear wheel. In doing so, it is exposed to extreme loads: combustion pressure, permanent friction, high temperatures and high engine speeds. A crankshaft is not a simple component, but is precisely engineered to withstand 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 dies more than increase performance, it is crucial for durability and reliability, especially on tuned 50cc scooters.

In our online store you will find OEM crankshafts for standard replacement as well as sport and racing crankshafts for higher requirements. With a reliable crankshaft, the engine can deliver its full potential, providing stronger performance, more precise throttle response, and confidence in any riding situation.

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

⇒ You can find the right part quickly and easily using our exploded views.

scooter Crankshaft types: features, advantages and Applications

Not all crankshafts are the same. Depending on the engine type, displacement and intended use, there are different product ranges offering the ideal balance between strength, performance, and price. Below is an overview to help you choose the right crankshaft.

✅ OEM crankshaft / standard

⇒ APPLICATION: OEM quality replacement for everyday scooters.

⇒ FEATURES:

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

⇒ ADVANTAGES: Inexpensive and easy to install (plug & play).

⇒ REQUIREMENTS: Replace oil seals and bearings.

⇒ RECOMMENDED Crankshafts: Motoforce, original crankshafts.

✅ Sport and racing crankshaft

⇒ APPLICATION: Everyday to sporty riding style or race track.

⇒ FEATURES:

  • Reinforced crankshaft
  • Webs: Full-circle, with inserts made from different materials
  • Stroke: Original - long
  • Connecting rod: Original / variable
  • Small end bearing: reinforced
  • Balancing: optimized
  • Performance: improved

⇒ ADVANTAGES: Higher reliability, better pre-compression, higher torque.

⇒ REQUIREMENTS: Suitable bearings. If stroke or rod length differs from stock, crankcase modification is required.

⇒ RECOMMENDED Crankshafts: Stage6 HPC MK2, Malossi MHR, Polini For Race.

✅ High-end crankshaft

⇒ APPLICATION: Exclusively for racing use.

⇒ FEATURES:

  • Extremely reinforced crankshaft
  • Crank webs: full circle, made from high-quality steel
  • Stroke: up to 50 mm
  • Connecting rod: reinforced and forged
  • Small end bearings: HQ-reinforced (often silver-plated)
  • Balancing: High precision with inserts to optimize performance (more or less weight affects torque and engine speed)
  • Performance: maximum torque, power and durability

⇒ ADVANTAGES: Superior durability, linear throttle response and high-end performance.

⇒ REQUIREMENTS: Crankcase machining (depending on model), high-end components and bearings, installation by qualified personnel.

⇒ RECOMMENDED crankshafts: Stage6 R/T, 2Fast, Ottopuntouno, Polini PRE.

large Selection: crankshafts, spare parts and complete tuning kits

We stock original crankshafts (Piaggio, Aprilia, Derbi, Vespa, Gilera, Yamaha / MBK, Peugeot, SYM, GY6)as well as affordable aftermarket versions from brands like Motoforce through to exclusive parts for scooter tuning.

When increasing displacement to 70, 88, or 100 cc, the stock crankshaft is usually no longer sufficient. The solution is to upgrade to a reinforced crankshaft or a long-stroke crankshaft capable of handling higher torque and higher RPM reliably. Without a suitable crankshaft, both performance and engine longevity will suffer.

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

Why replace the crankshaft?

A crankshaft operates permanently under extreme conditions: high temperatures, continuous load, and lubrication that is not always ideal. Over time—or due to poor maintenance—it wears out and can fail. When this happens, the damage is often not limited to the crankshaft alone; the cylinder and other critical components can also be affected, resulting in far higher repair costs than a timely crankshaft replacement.

Crankshaft failure is very common on 50cc scooters. In these cases, installing a reinforced crankshaft is highly recommended. For setups with 80, 88, or 100 cc, a long-stroke crankshaft (43–45 mm) is required.

Assembly tips

  • Always use new bearings and seals
  • Check perfect alignment ⇒ prevents vibrations and damage
  • If you have no experience, leave the installation to a specialist or professional workshop

Crankshaft Maintenance and inspection

Each crankshaft type requires proper care to ensure long-term reliability. During regular maintenance work, such as piston replacement, bearing clearances and tolerances should be checked and kept within specified limits.

Pay close attention to unusual noises or vibrations. These are usually the first signs of wear on the crankshaft or bearings. If bearing noise becomes audible or vibrations increase, the engine should be inspected immediately to prevent serious damage.

FAQ - Frequently asked questions about crankshafts

⇒ 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? Crankshaft replacement is a demanding job and requires special tools. If you lack experience, professional installation is strongly recommended. Alternatively, strictly follow the manufacturer’s instructions or an appropriate installation guide.

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