Description
Tuning Kit Stage6 Big Racing 77cc AM6
Stage6 is known for developing high-performance tuning parts and continuously pushing new projects forward. Alongside classic scooter tuning, the brand now also offers cylinders and complete engine packs with matching components for geared mopeds. Here for Minarelli AM6: Engine pack cylinder + exhaust 77cc Stage6 BigRacing Minarelli AM6 black / orange.
Stage6 BigRacing engine kit scope of delivery
- 77cc Stage6 cylinder, 50mm bore, aluminum, with 5 transfer ports and bridged exhaust port
- Vertex 1-ring piston, D. 50mm
- One-piece high-compression aluminum cylinder head
- Gasket set (base and head gaskets)
- Stage6 R/T 80 – 90cc exhaust low mount
- Venturi adapter sleeve – inner D. 32mm / outer D. 35mm / height 42mm
- Black / orange aluminium silencer – inner d. 23mm / outer d. 60mm / length 229mm
Stage6 BigRacing cylinder for 50cc supermoto / Enduro
The Stage6 Big Racing cylinder is a racing cylinder developed specifically for geared mopeds and supermoto models. This modern tuning cylinder delivers a strong increase in power, especially when combined with the matching Stage6 R/T 80 – 90cc racing exhaust included in the pack.
Although the BigRacing looks fairly discreet from the outside, it is a true big bore cylinder. It is not simply a bored-out stock cylinder, but a purpose-built big bore kit with optimized transfer ports and a large exhaust port designed to support the higher output. Externally, it follows the look of the original cylinder and even features a stamped 49cc marking; however, it is clearly a 77cc cylinder.
Installation is straightforward and does not require any machining of the engine case. The squish clearance is pre-set to an optimized value for the respective engine type.
On our P4 dyno, the BigRacing delivered 23 hp and 13 Nm using a standard setup (24mm carburetor, original ignition, racing exhaust, etc.).
The cylinder features relatively moderate port timings (190° – 125°), a generous cooling volume, and a high-quality Vertex piston. These characteristics contribute to reliable and robust operation, provided the setup and tuning are correctly adjusted.
Note: The use of longer cylinder head nuts is recommended to ensure proper tightening of the head. A reinforced crankshaft with standard stroke should be used.
Stage6 R/T racing exhaust
The cylinder is paired with the Stage6 R/T 80 – 90cc Minarelli AM6 exhaust, a high-end exhaust designed specifically for tuned Minarelli AM6 engines.
This is a classic racing exhaust made from carefully hand-welded steel sections and fitted with a high-quality silencer, shown here in black (other colors available). As typical for high-end systems, the exhaust is supplied in racing finish, meaning unpainted and untreated.
The exhaust is designed to deliver strong performance across the entire RPM range and is optimized for high-performance cylinders between 80cc and 90cc. For ambitious 2-stroke setups, it provides a suitable match to fully utilize the cylinder’s potential.
NOT STREET LEGAL
