O.S. SPEED R2105 1D900

New OS Speed R2105 replacing the O.S. SPEED R2104 

Features:

Based on R2104, almost all the parts has been newly developed.

• New design crankcase, Performance is improved by adopting a new mold.
• New crakshaft by changing the counterweights from 4 to 5mm and optimizing the weight balance, the feeling in low and mid-range power is improved.
• New 9-ports cylinder adapted to the new crankcase internal design.
• New look cooling-head, changed from conventional black color to polished silver with clear coating.
• New backplate with steel thrust plate.
• New main-needle design with double o-rings for more tuning stability.
• New shaped idle-needle for better torque in the low rpm area.

Specifications

Content: 3.49 cc 
Bore: 16.08mm  
Stroke: 17.20mm  
HP: 2.8 ps / 2.76 hp at 33000 r.p.m.
Practical range: 4000-45000 r.p.m.
Weight: 340g