Factory carb setting
HSN in .86mm
MRN in .07mm
LSN in .57mm
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