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Cylinder kits

(191 products)
Cylinder Cylinder kits Cylinder Heads and Pistons Camshafts and Valves Cylinder Gaskets Cylinder Accessories
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Tuning level
Original Sport Racing High-end
Cylinder material
Aluminium Cast Iron
Displacement
50cc 60cc 65cc 66cc 70cc 72cc 75cc 77cc 78cc 80cc 85cc 86cc 87cc 88cc 90cc 94cc 95cc 96cc 100cc 110cc 130cc 180cc 63cc
Piston pin
12 mm 13 mm 14 mm
Stroke
Original 39,7 mm 42 mm 43 mm 44 mm 44,8 mm 44,9 mm 45 mm 47 mm 48 mm 50 mm
Conrod length
Standard 85 mm 90 mm 95 mm 98 mm 100 mm
Series
90-WR 96-WR Bestia BigBore 100cc BigRacing Due Plus Handmade Iron Max MHR Replica MHR TEAM Pro Race R/T Racing Racing Factory RF50WR RF70WR Serie 6000 Sport Sport Pro StreetRace T6 Testa Rossa TPR TPR Factory Trophy WR 96cc Xtrem
Brand
2Fast Airsal Athena Bidalot D.R. Derbi Doppler Italkit Malossi Metrakit MotoForce MotoForce Racing MVT Parmakit Polini Stage6 Stage6 R/T Standard Parts Top Performances Voca Racing
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Polini
Cylinder Kit Polini 50cc cast iron Minarelli AM6
Article no.: P133.1011

Cylinder Kit Polini 50cc cast iron Minarelli AM6

205,00 €
Currently not in stock
RRP
237,00 €
-14% Discount
Polini
Tuning Kit cylinder + crankshaft Polini Sport 80cc AM6
Article no.: P133.1009.1

Tuning Kit cylinder + crankshaft Polini Sport 80cc AM6

399,00 €
Currently not in stock
RRP
455,00 €
-12% Discount
Parmakit
Cylinder Kit d.45mm Parmakit 70 Honda MTX 50
Article no.: PM31525.00

Cylinder Kit d.45mm Parmakit 70 Honda MTX 50

244,00 €
Currently not in stock
Standard Parts
Cylinder Kit Sport 66cc 45mm Honda MT 50
Article no.: MOF-42636

Cylinder Kit Sport 66cc 45mm Honda MT 50

76,00 €
Currently not in stock
79,00 €
-4% Discount
MotoForce Racing
Tuning Kit Motoforce Racing cylinder + crankshaft 80cc cast iron AM6
Article no.: MF26.18810/PACK01

Tuning Kit Motoforce Racing cylinder + crankshaft 80cc cast iron AM6

312,30 €
Currently not in stock
347,00 €
-10% Set-Rabatt
Polini
Cylinder Kit Polini Sport 80cc cast iron Derbi Euro 2
Article no.: P109.0013

Cylinder Kit Polini Sport 80cc cast iron Derbi Euro 2

202,00 €
Currently not in stock
RRP
238,00 €
-15% Discount
Top Performances
Cylinder Kit Top Performances Black Trophy 50cc Derbi Euro 2
Article no.: T9927980

Cylinder Kit Top Performances Black Trophy 50cc Derbi Euro 2

197,00 €
Currently not in stock
RRP
259,00 €
-24% Discount
Derbi
Cylinder original 50cc Derbi Euro 3 / 4
Article no.: OE-DE877719

Cylinder original 50cc Derbi Euro 3 / 4

266,00 €
Currently not in stock
Stage6 R/T
Cylinder Kit Stage6 R/T BIG BORE 95cc 14mm pin Minarelli AM6
Article no.: S6-7518813

Cylinder Kit Stage6 R/T BIG BORE 95cc 14mm pin Minarelli AM6

459,00 €
Currently not in stock
RRP
510,00 €
-10% Discount
Stage6 R/T
Cylinder Kit Stage6 R/T 95 Derbi
Article no.: S6-7519312

Cylinder Kit Stage6 R/T 95 Derbi

459,00 €
Currently not in stock
RRP
510,00 €
-10% Discount
Airsal
Cylinder Kit Airsal Sport 65,7ccm 45mm Honda MT 50
Article no.: C02040845

Cylinder Kit Airsal Sport 65,7ccm 45mm Honda MT 50

104,00 €
Currently not in stock
107,00 €
-3% Discount
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Cylinder kits for 50cc gear Bikes

Unlike most larger-displacement motorcycles, 50cc geared motorcycles are usually equipped with 2-stroke engines. The fact is that on a 2-stroke engine, the cylinder has the main impact on performance. This is where the air-fuel mixture is converted into energy. Power, torque, acceleration, and reliability all depend directly on it. Choosing the right cylinder kit - material, displacement, port timing, or piston type - has the biggest impact on operation, performance, and engine characteristics.

In our online shop, we carry cylinders for all types of projects.

Below is a guide to help with the selecting the right cylinder.

Finding the right cylinder

In our online shop, we defined four categories to classify cylinders according to performance: Original, Sport, Racing, and High-End.

⇒ Original / OEM replacement : Matches factory specifications. High reliability, low consumption, and minimal maintenance. No performance increase, but compliant with manufacturer specifications.

⇒ Sport: The simple design of the original is retained, with a more dynamic orientation. Provides increased performance while maintaining high reliability and moderate maintenance requirements. Includes 50cc and 70cc cylinders, as well as larger kits for daily use.

⇒ Racing: For racing and very high-performance setups. Designed for maximum power and torque. Only a few stock components can be retained, and extensive modifications are required.

⇒ High-End: For experienced tuners. Installation requires extensive modifications to the crankcase for the cylinder base, crankshaft, and other components. Very large displacements and correspondingly high performance.

This classification helps select the parts to combine with the cylinder (exhaust, crankshaft, carburetor, etc.). Components should belong to the same category to ensure performance and reliability.

Discover a wide range of cylinders for the most popular models: Derbi Senda, Beta RR, Rieju MRT, Gilera SMT, Aprilia RS, Yamaha TZR, Fantic XM / XE as well as many other models.

Ready-to-install cylinder kits

With a few exceptions, cylinder kits are supplied complete with all parts required for installation:

  • Cylinder head (if required)
  • Piston and piston rings
  • Piston pin and circlips
  • Gasket set (cylinder head, base gasket, exhaust)

All spare parts are also available individually for specific repairs.

Restoration and tuning of 50cc motorcycles

For restorations and tuning projects, well-known brands are available such as Stage6 R/T, Stage6, 2Fast, Polini, Malossi, Top Performance, Bidalot. Brands like Motoforce offer parts for cost-effective and reliable repairs.

Gear bike tuning

When tuning a 2-stroke engine, several components must be combined depending on the objective.

The cylinder is the central element of the setup. Depending on the variant (transfer ports, displacement, compression), a matching exhaust and a carburetor with the appropriate diameter should be selected. A reinforced crankshaft is also necessary. Only the correct combination of components allows the setup to deliver its full performance while remaining reliable.

Notes and examples:
  • Original 50cc: OEM cylinder with approved parts (OEM-type exhaust, original carburetor)
  • Sport: Slightly larger carburetor combined with an exhaust matched to the cylinder size. The stock crankshaft can be used, but a reinforced version is recommended.
  • Racing: Larger carburetors (19-34 mm depending on displacement) and a racing exhaust are required. Reinforced crankshaft and reinforced clutch are necessary.
  • High-End: Carburetors (24-38 mm depending on displacement) combined with high-end racing exhausts such as Stage6 R/T or 2Fast. Reinforced crankshaft, extra reinforced clutch, and racing ignition are required.

⇒ Important:

Aluminum cylinders must be installed while respecting the squish clearance, i.e. the distance between piston and cylinder head at top dead center, according to manufacturer specifications.

For racing and high-end engines, replacing the complete piston is recommended rather than only the piston rings.

The choice of oil for the mixture should match the intended use: street, track, off-road.

The carburetor diameter serves as a guideline and must be adapted to displacement and cylinder category. A 50cc racing cylinder, for example, does not require as large a carburetor as an 88cc sport cylinder.

For the exhaust, besides the category, the correct volume is also essential. A 50cc racing cylinder will not work properly with a racing exhaust designed for 80cc.

ATTENTION! Any upgrade requires carburetor adjustment with jets! Without proper adjustment, damage may occur.

FAQ — Frequently asked questions about cylinders

⇒ When should the piston be replaced?

If the engine starts poorly or loses power, it is time. Service life depends on the cylinder type. With an OEM cylinder, around 10,000 km is possible; at higher RPM and under intensive use, the interval can drop to around 10 hours for racing engines.

⇒ 1-ring piston or 2-ring piston?

It depends on the goal: maximum performance → single-ring piston. Reliable compromise: two-ring piston. Many cylinders also achieve very good performance with two rings.

⇒ Aluminum or cast iron?

Cast iron is generally less sensitive to temperature changes than aluminum and is therefore suitable for daily use. Aluminum is suitable for racing use, as it dissipates heat better and allows consistent performance, but requires precise tuning.

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