As for the Type-R engine, the long-stroke 5-plus-3-port power plant was developed for medium to high speed tracks and it features a new crankcase, end cap and 22E carburetor adopted.
Specification
Displacement ： 3.49cc / 0.213 cu.in.
Bore : 16.27mm/0.641in.
Stroke : 16.80mm/0.661in.
Output: 2.68ps/2.64hp/34,000r.p.m
practical rpm range: 4,000-42,000 r.p.m.
weight : 347g / 12.24oz (TYPE-S) 352g/12.42oz.(TYPE-R)