O.S. is gearing up for triumph at major 1/8 scale on-road championships utilizing the 21XZ-R ABC! Tungsten-weighted crankshaft creates maximum security for constant low- and mid-speed torque.
The cylinder liner features 7 scavenger ports and 3 exhaust ports for significantly more effective combustion.
The crankcase and 21M carburetor are newly produced.
Lighter piston.
More powerful con pole.
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