displacement: 250cc
basis: 200cc engine casing with Li or GP-crankshaft (107mm rod)
usage: very heavy tuning
reliability: good
power: 35 hp (estimated)
manufacturer barrel: AF Rayspeed, England
material: alloy cylinder with nikasil plating
port timings: 130/186 (under assumption that the piston matches in bdc)
clearance: 6/100
manufacturer piston:
method: forged
rings: 2x 1,0mm chrome
length:
compression height: 39mm
gudgeon pin: 16mm
The RB is the newest development from AF Rayspeed. It is an advancement of the TS-1 but does not substitute it.
In terms of power it a class above the TS-1.
It is the most powerful cylinder out of the box you can buy at the moment.
The alloy cylinder with the Nikasil coating makes it very reliable.
The complete kit includes barrel, Asso piston, reed valve, intake manifold, gaskets.
Attention: A special RB exhaust is needed, Ts-1 exhausts need to be modified to use on the RB.
The TS-1 flange still can be used.
New version: 2x1.0mm chrome rings
It uses a forged Asso piston.
The RB25 mono port has only one exhaust port. The small auxiliary ports of the RB25 triple port allow only a small central port. The mono port has a much bigger central port which is more important. Alos it can be tuned further more.
The English tuner Darrell Taylor achived 47 hp on a modified RB25 mono port!
Attention: TS-1 exhausts don't fit, a special RB exhaust has to be used.
Attention: The engine casing needs to be machined.
