This is the Ultimate M5S based on the OS B2103 Type R engine Broke in by Adam Drake (Drake-In). 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.

Features:

• 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

Technical specifications:

• 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