copy of Kit 50 high engine Ø40mm BIDALOT RACING RF50 WR COMPETITION DERBI euro 3, 4 & 5

Top engine RF50WR Racing COMPETITION – DERBI E3 – Ø40mm

This high-end part is the Racing version of the RF50WR top engine, designed exclusively for DERBI E3 engine with 39.7mm stroke crankshaft and 85mm connecting rod.

Through careful design work, the valve heights and compression ratio have been optimized to deliver exceptional performance. For optimal operation, this part must be used with the following components:

Exhaust pipe Ref. 150 00 588

Racing Factory Ignition Ref. 140 00 382

Complete Racing Intake: VForce3i HONDA CR85 reed valve, CR85 manifold, KEIHIN PWK Ø28 or Ø30mm carburetor

This configuration is aimed at an experienced audience, with the technical skills necessary for the assembly, tuning and regular maintenance of this type of engine. It is not recommended for everyday use, in which case the adaptable version is preferable.

Advanced design:

The cylinder was fully modeled in 3D CAD. Its water chamber surrounds all the transfers and exhaust with a constant thickness, ensuring excellent thermal stability and optimal heat dissipation.

The cylinder head, also made of heat-treated aluminum, incorporates a water chamber around the combustion chamber. It is self-centering and extends 2.4 mm into the bore for efficient and even cooling.

Exhaust flange:

The specific exhaust flange is fixed by 4 screws, but a classic flange with 2 holes with a center distance of 48 mm can also be fitted. Several adaptable flanges are available separately to accommodate the majority of exhausts on the market:

Ø28mm x L30mm

Ø30mm x L30mm

Ø32mm x L30mm

Ø28mm x L30mm Label (original model of the RF50WR pot)

Pack composition:

Ø40mm aluminum cylinder, Nikasil coating, 5 transfers, booster exhaust

High compression aluminum cylinder head, self-centering, 2.4mm penetration

Hypersilicon piston Ø40mm – axis Ø12x33mm – axis height 25mm

Chrome-plated steel segment Ø 40x0.8mm , curved, made in Japan

Set of base gaskets of different thicknesses

Cylinder head O-ring set

4 fixing studs

Complete screws

Please note: This part is designed for sport use and is not approved for open roads.