Stage6 Cylinder Kit BigRacing 77cc Minarelli AM6

The cylinder was developed in close cooperation with the MXS Racing experts; by benefitting from their considerable experience of gearshift mopeds 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 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.

The BigRacing cylinders impress with ease of installation, outstanding performance, and high reliability.

- Installation is very easy, crankcase milling or any other modification are not necessary. Squish clearance is pre-set to a value optimized for the respective engine type.
- In terms of output, the BigRacing cylinders knock it out of the ballpark: we measured a whopping 23 PS and 13 Nm on our P4 test bench using a standard set-up (24mm carburetor, original ignition, racing exhaust etc.).
- Port timings are relatively low, cooling system volume is quite large and the piston is a top quality Vertex piston. All of these factors contribute to the cylinder's high dependability and robustness, provided that set-up and adjustments are appropriate.

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!