Twin ballraced. With six-point mounting, piston ring and heat-sink head.
Specification
Capacity 11.50 cc
Power approx. kW (BHP) 1.84 (2.5) at 16,000 rpm
Speed range approx. 2,000~18,000 rpm
Bore 25.8 mm
Stroke 22.0 mm
Carburettor 60K
Shaft thread 5/16" - 24 UNF
Weight approx. 553 g