Cylinder Bidalot Racing RF50WR 50cc Derbi Euro 2 c.39

Cylinder Bidalot Racing RF50WR 50cc adaptable for Derbi E2.

The Cylinder Bidalot Racing RF50WR of 50cc for Derbi E2 is the direct option if you are looking for an adaptable kit that does not require you to change the crankshaft. Unlike the Racing version, this model is designed to be installed with an original stroke and connecting rod length crankshaft, making installation easier and reducing the need for adjustments.

This cylinder has been optimized for daily use, reducing the port heights and compression ratio compared to the Racing version. This makes it less sensitive to setup and peripheral components, offering reliable and consistent performance.

Thanks to its 3D CAD design, the water passage surrounds all the transfers, maintaining a stable temperature and ensuring the durability of the cylinder. The cylinder head, with heat treatment, also features a water passage that surrounds the combustion chamber, efficiently dissipating heat. In addition, it self-centers in the cylinder, entering 1.1mm inside.

The specific exhaust nozzle is secured with 4 screws. However, it is possible to install a nozzle with 2-hole mounting, with a center-to-center distance of 48mm.

You can find, available for sale as an accessory, exhaust nozzles of different diameters, allowing adaptation to almost all exhausts on the market. These nozzles are available in the following dimensions:

• Ø28mm x L30mm
• Ø30mm x L30mm
• Ø32mm x L30mm

Technical specifications

• Cylinder: Aluminium with heat treatment and Nikasil coating Ø40mm
• Cylinder Head: Aluminium with heat treatment, self-centering and entering 1.1mm into the cylinder, with high compression combustion chamber
• Transfers: 5
• Exhaust: With boosters
• Piston: RF50WR hypersiliconed Ø40mm
• Piston profile: Elliptical (New 2018 profile), specific to reduce operating clearances
• Piston pin height: 22mm
• Ring: Chrome steel Ø40x1, ground and domed, Japanese manufacture
• Piston pin: Ø12x33mm
• Gaskets: Set of base gaskets of different thicknesses
• Gaskets: Set of cylinder head O-rings
• Nuts: 4
• Bolts: Various