Description
cylinder kit Stage6 BigRacing 77ccm for AM6
Since its inception, Stage6 are committed to develop performance-enhancing tuning parts and don't shy away from tackling new tasks. As of now, they are getting into the market for 50cc bikes by introducing the Stage6 Cylinder Kit Big Racing 77cc for Minarelli AM6.
Contents Stage6 BigRacing 77
- 77cc cylinder, aluminium, 50mm bore, with 5 transfer ports and 32mm bridged exhaust port
- 1-ring Vertex piston, d. 50mm
- high compression cylinder head, monobloc, aluminium
- gasket set (base and head gaskets)
Design of big racing cylinder for 50cc motorcylces
The cylinder was developed in close cooperation with the MXS Racing experts; by benefitting from their considerable experience of 50cc bikes and drawing from their own extensive technical know-how, Stage6 was able to design a thoroughly convincing new tuning cylinder.
The cylinder features a rather basic and inconspicuous exterior, but we all know that appearances can be deceptive. We're talking genuine ""Big Bore"" here – cylinder layout is not based on a modified standard model that was milled open to create a bigger bore, but was designed as a Big Bore right from the start, with matching transfer ports and a bridged exhaust port big enough to support the excess performance.
Advantages of the Stage6 BigRacing cylinder
- Easy installation: Installation is particularly straightforward, as no milling of the engine block is necessary. The squish gap is preset to the optimum value for the respective engine type.
- High performance: On the P4 test bench, a standard setup (24 mm carburettor, original ignition, racing exhaust) measured 23 hp and 13 Nm.
- Robust and reliable: The cylinder timing (190° - 125°), the large cooling volume and the high-quality Vertex piston ensure high reliability – provided that the setup and settings are right.
Use of Stage6 BigRacing cylinder AM6
Displacement is 77cc (50mm piston) and is accordingly not street-legal (in many countries). We strongly recommend a reinforced crankshaft with standard stroke.
The exterior is a replica of the original cylinder with a 49cc stamp; don't worry, this is definitely a 77cc cylinder!
Note: we recommend to use "long" cylinder head nuts to achieve correct torque when tightening the bolts.
Not street-legal (depending on country).

Stage6 BigRacing cylinder
The Big Racing cylinders are extremely powerful cylinders for 50cc supermotos. Although they are very powerful high-end cylinders, they offer a good balance of performance and reliability for intensive, regular, even daily use.
The aluminium cylinders have a displacement of 77 to 88 cc (with the corresponding crankshaft ) and were mainly developed for 50cc motorcycles with Derbi and AM6 engine, e.g. Rieju MRT, Beta RR or Sherco.
In combination with a suitable exhaust, a complete intake system and a suitable gearbox, the BigRacing can achieve maximum power with maximum torque and increased top speed.
The Stage6 R/T series delivers even more power, with uncompromising performance for use on the race track.
technical data :
- Aluminium cylinder
- 1-ring piston
- Original big bore design (not simply opened up)
- Transfer ports and compression designed for maximum reliability
- 77cc displacement for crankshaft with original stroke
- 86cc or 88cc cylinder for long stroke crankshaft
- One-piece cylinder head
- Discreet design with 49ccm lettering
- Also available as a kit with exhaust or crankshaft
- All spare parts available separately (pistons, gaskets)
How to Install a cylinder on a scooter, motorcycle or moped
The cylinder or cylinder kit is the heart of the engine on scooters, motorcycles and mopeds. It consists of a cylinder, a piston with piston ring(s), a cylinder head and gaskets needed for installation.
The service life of a cylinder depends on whether it has been fitted correctly.

Tuning Level: High End racing
We categorize our products into different performance levels Original, Sport, Racing and High End , so that our customers can choose the right parts for their setup. It is really important to combine parts that belong to the same tuning level, this is especially true for cylinders, crankshafts and exhausts.
High End Racing products are exclusively designed for racing and should only be handled by tuning pros with the appropriate technical know-how. High-end racing parts often require modifications or machining of certain elements to accommodate the often larger components (larger crank webs, larger intake, etc.). Whether you stick with 50cc or increase the displacement, high-end racing parts offer much higher performance than the original parts and are the most powerful tuning parts.
Note: To ensure the reliability of the engine, it is important that the parts are compatible and that you do regular maintenance on your two-wheeler.
Aluminium cylinders
Aluminium cylinders are more powerful than cast iron cylinders, but require more regular maintenance and must be combined with different components such as a reinforced crankshaft and a larger carburetor.
How to run in an aluminium cylinder?
Aluminium cylinders should be run in for about 200 kilometers , and you should use a fully synthetic engine oil.
Note: To ensure optimum performance and reliability, it is advisable to measure the squish clearance. Just have a look at our tutorial How to adjust squish clearance.
Cylinder Stage6 Big Racing 77cc Minarelli AM6 | |
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Article no. | S6-7018810 |
EAN | 4051272021084 |
Weight | 3,00 kg |
Series | BigRacing |
Brand | Stage6 |
Product type | Cylinder kit |
Tuning level | High-end |
Displacement | 77cc |
Homologation | No |
Piston pin | 12 mm |
Cylinder material | Aluminium |
Bore | 50 mm |
Stroke | Original |
Conrod length | Standard |
Spark plug thread | M14 long |