ABC construction, Aluminum piston with Brass liner thats Chrome plated
Dual ball bearing-supported crankshaft
Dual needle valve carburetor with remote High Speed Needle Valve
Dual bushing-supported connecting rod

Spec.
Displacement: 5.81
Bore: 20.5mm 
Stroke: 17.6mm 
Suggested prop: 10x6
RPM: 2,000 ~ 18,000
Weight: 322g