MOTOR OS SPEED R21-GT

OS SPEED R21 GT is an all-new 5-port engine.
It features a newly developed piston and 5-port cylinder, crankshaft, crankcase, Specially made to fit on-road GT track. 
The OS SPEED R21 GT has a 7mm carburetor restrictor.
Tech specifications:

• Displacement: 3.49 cc
  Bore: 16.08mm
  Stroke: 17.20mm
  Intake ports: 5-port
  Exhaust port: 3-port
  Practical RPM range: 4,000 – 42,000 rpm
  Max. power output: 2.65 ps / 2.61 hp / 34,000 rpm
  Weight: 369Gr.