- 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.