Here is the latest high engine, RF50WR, in adaptable version, for DERBI E3 engine (D50B0). The best 50cc kit on the market, it will clearly not have the torque of an 80cc, but in terms of power, we are on high level equipment! Target power rpm: from 11,500 to 14,000 rpm!
Adaptable means that this high engine can be substituted directly for the original model. Unlike the Racing version, it does not require a special crankshaft, and is designed to be fitted with a racing crankshaft and connecting rod length identical to the original.
On the other hand, its heights of distributions, and the compression ratio, have been reduced, compared to the Racing version. Thus, it will be less sensitive to the various settings, and especially to the peripherals used.
For ALLDAYS use, we highly recommend this adaptable model!
Entirely modeled in 3D CAD, the cylinder sees its water chamber go around all the transfer and exhaust cores, with constant thicknesses, able to guarantee great dimensional stability of the cylinder, due to optimized cooling.
The cylinder head, heat-treated, is also equipped with a water chamber, surrounding the combustion chamber, for good heat dissipation and perfect cooling. It is self centered in the cylinder, and fits 1.1mm into the bore on this version.
The fixing of the specific exhaust flange is ensured by 4 screws. However, it is possible to mount a fixing flange with 2 holes, with a center distance of 48mm.
You will find, sold as accessories, exhaust flanges of different sizes, allowing the adaptation of almost all exhausts on the market. These flanges are available in the following dimensions:
Ø28mm x L30mm
Ø30mm x L30mm
Ø32mm x L30mm
Technically, this thermal group is composed of:
High engine RF50WR Adaptable DERBI E3:
Aluminum cylinder, with heat treatment, nikasil coating Ø40mm
Aluminum cylinder head, with heat treatment, self-centering and re-entering 1.1mm in the cylinder, with high compression combustion chamber
5 transfers
Booster Exhaust
RF50WR hypersilicon piston Ø40mm
Set of base gaskets of different thicknesses
New Profile 2018, elliptical, specific, to reduce operating clearances
22mm axle height
Segment Chromed steel Ø40x1, domed lapped, made in Japan
Shaft Ø12x33mm
Set of cylinder head O-rings
4 cylinder studs
Miscellaneous screws
