This is the Ultimate M5S based on the OS 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.
This engine has been developed for medium to high speed tracks.
- The long-stroke off-road engine put a high value on beasty power in mid-high speed range.
- The cooling head, carburetor, crankcase cover plate are designed new.
- The new DLC-coated crankshaft has two tungsten counterweights for smooth rotation and better balancing.
- Ceramic rear bearing.
- O-ring under the cooling head for reducing vibration and preventing dust from entering the engine.
- A newly designed 22E carburetor for producing high power
- displacement 3.49cc
- bore 16.27mm
- stroke 16.80mm
- rpm 4000-42000 rpm
- max output 2.64hp/34000 rpm
- weight 352gr
- recommended exhaust: UR352141 o UR352142
- port 5-port
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