Cylinder Stage6 R/T 70cc Derbi Euro 3
Description
Stage6 R/T 70cc high-end cylinder for Derbi E3 / E4
From the racing specialists at Stage6 R/T comes this absolute top-tier cylinder, which has already broken several records: Cylinder Stage6 R/T 70cc Derbi Euro 3 / Euro 4 (D50B0 / D50B1) with a 47.6mm bore.
Included in the Stage6 70 cylinder kit for Derbi Senda:
- Aluminum cylinder with 47.6mm bore, with 6 transfer ports and split exhaust port
- High-quality 12mm piston with extra-thin piston ring
- High compression cylinder head, modular design, with removable combustion chamber (orange anodized)
- R/T spacer / adapter plate with innovative mounting design
- CNC-milled exhaust flange
Stage6 R/T 70cc cylinder MK1 - Innovative assembly
The real game-changer with this kit is the spacer/adapter plate installation. The CNC-machined adapter plate is bolted to the engine casing and holds the cylinder using external studs. This eliminates the need for through-studs, which opens up new possibilities for further modifications to the exhaust and transfer ports since they are no longer restricted by conventional race cylinder designs.
The Viton® O-ring seal between the adapter plate and cylinder ensures leak-free assembly and eliminates the need for later adjustments. Additionally, the base plate is independent of the cylinder, meaning you can change the piston without removing the plate.
Stage6 R/T Racing Cylinder 70 - High-end racing performance
In terms of performance, this cylinder is at the absolute top – 24HP is achievable with the right setup. Thermal efficiency is outstanding: the combustion dome is secured with five bolts, each of which is individually cooled through its own cooling pocket. This effectively eliminates heat-related piston seizures caused by hotspots around the studs.
Stage6 cylinder installation instructions
Note: the crankcase has to be machined a little to make room for the cylinder base (D. = 56.7mm +/- 0.1mm, 10mm deep). A detailed installation manual is included.
- Diameter of cylinder base: 56.7 mm
- Length of cylinder base: 10 mm
Setup stage6 R/T 70cc Kit Derbi
The 70 R/T cylinder kit is comes with an exhaust flange that allows installation of all standard Derbi exhausts.
We currently recommend the following Stage6 exhausts for maximum performance:
For the rest of the setup, we suggest the following components:
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.