Description
Since right from the very start, Stage6 are committed to develop performance-enhancing tuning parts and don’t shy away from tackling new tasks. They are getting into the market for 50cc bikes / supermotos now, this is a tuning pack for Derbi Euro 3 / Euro 4: Tuning Kit cylinder + crankshaft Stage6 BigRacing 77cc Derbi Euro 3 / 4.
Includes:
- 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)
- HPC crankshaft original stroke 12mm piston pin
- Crankshaft bearings and oil seals SKF C3 polymer cages
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.
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.
The exterior is a replica of the original cylinder with a 49cc stamp; don’t worry, this is definitely a 77cc cylinder!
Attention: For the assembly of this cylinder kit, you have to use longer stud bolts (M7x120mm).
Not road-legal.
