See: Modelix Racing
Modelix Racing have introduced the new Ultimate Racing M5S Ceramic nitro off-road engine. Developed for medium to high speed tracks and based on the O.S. B2103 Type R engine, this 5-port long-stroke engine offers great power at medium-high speeds. The cooling head, the crankcase cover plate and the carburetor feature a new design. The new DLC-coated crankshaft has two tungsten counterweights for smooth rotation and better balancing. It comes with ceramic rear bearing, the 22E carburetor and an O-ring under the cooling head for reducing vibration and preventing dust from entering the engine.