Description
Cylinder kit Stage6 Big Racing 77cc Derbi Euro 3/4
Stage6 has dedicated itself to the development of high-performance tuning parts and is constantly taking on new challenges, which is why they are now also producing cylinders for 50cc supermotos. For Derbi Euro 3 / Euro 4: Stage6 Big Racing 77cc cylinder kit.
Design Big Racing cylinder for 50cc motorcycles
The cylinder was developed in close cooperation with the professionals from MXS Racing. On the one hand, it was possible to benefit from their experience in the field of manual transmission mopeds and, on the other hand, to use their own technical know-how, which enabled the Stage6 engineers to develop a thoroughly successful and innovative tuning cylinder.
Visually, the BigRacing keeps a low profile, but appearances can be deceiving. This is a true big bore aluminum cylinder – not just a bored-out standard version. It was designed from the ground up as a genuine big bore kit, featuring matched transfer ports and a large exhaust port that effectively supports the increased performance.
Advantages of Stage6 BigRacing cylinder
- Simple installation: Installation is particularly straightforward as no milling work is required on the engine block. Squish clearance is optimized for the respective engine type.
- High performance: 23 hp and 13 Nm were measured on the P4 test bench with a standard setup (24 mm carburetor, original ignition, racing exhaust).
- Robust and reliable: The cylinder's port timings (190° - 125°), the large cooling volume and the high-quality Vertex piston ensure high reliability - provided that the setup and settings are right.
Use Stage6 BigRacing cylinder
Displacement is 77cc (50mm piston), i.e. not street legal. You should use a reinforced crankshaft with standard stroke.
From the outside, the cylinder is a replica of the original cylinder with a stamped 49cc mark; but don't worry, it is clearly a 77cc cylinder.
Note: we recommend using "long" cylinder head nuts to be able to tighten the head properly.
Without road approval.
Scope of delivery Stage6 Big Racing 77
- 77cc aluminum cylinder, with 5 transfer ports and bridged exhaust
- Vertex 1-ring piston, 50mm
- High-compression cylinder head, one-piece, aluminum
- Gasket set (base and head gaskets)
Note: Motorcycles with Derbi Euro 4 engines use a slightly smaller temperature sensor (thread: M12 x 1.5) than Euro 3 models (M14 x 1.5). To attach the smaller Euro 4 sensor to the cylinder head, you will thus need the adapter MF96.91010.
