This is the OS B2103 Type R engine with OS T2100SC exhaust system.
The OS B2103 Type R engine is a 5-port long-stroke engine that offers great power at medium-high speeds. The crankcase, the crankcase cap and the carburetor feature a new design. The new DLC-coated crankshaft has two tungsten counterweights for smooth rotation and better balancing. It shares the same new features as the Type S engine except the cylinder and the cooling head which has a standard round shape.
- The long-stroke off-road engine put a high value on beasty power in mid-high speed range.
- The crankcase, carburetor, cover plate, crankshaft and inner head are designed new.
- All the parts are interchangeable to those of TYPE S’s.
- A newly designed 5-port cylinder & piston set (5 scavenging port+ 3 exhaust port)
- A standard round type outer head
- A newly designed 22E carburetor for producing high power
- Includes the OS T2100SC exhaust system
- displacement 3.49cc
- bore 16.27mm
- stroke 16.80mm
- rpm 4000-42000 rpm
- max output 2.64hp/34000 rpm
- weight 354gr
- exhaust T2100SC
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