Features

Brush up some parts from R21 seriese.
The cylinder liner adoptes a newly designed 9 port to increase torque on the high grip road surface.

Crankshaft is coated by O.S.SPEED traditional DLC.
The connection from low speed to top speed is improved by changing the counter balance.

Inner head adopts 'O' ring which shut out dust from entering the cylinder liner.

The outer head is black and red two-color alumite so that it can be recognized as an O.S.SPEED brand engine with one eye.

Adopts the latest designed parts for various part.
By widening the fin pitch, it can balance cooling performance and weight balance.
That contributes to improvement of the running performance of the mounted machine.

Specifications

Stroke volume: 3.49cc / 0.213 cu.in.
Bore: 16.08mm/0.633in.
Stroke: 17.20mm/0.677in.
Output: 2.8ps/2.76hp/35,000r.p.m
Practial rotation speed: 4,000-45,000 r.p.m.
Weight: 340g / 11.99oz

Combo set is also available: OS-1C601