O.S. is gearing up for triumph at major 1/8 scale on-road championships with the 21XZ-R ABC! Tungsten-weighted crankshaft produces maximum balance for consistent low- and mid-speed torque.
The cylinder liner features 7 scavenger ports and 3 exhaust ports to get more efficient combustion.
The crankcase and 21M carburetor are newly designed.
Lighter piston.
More durable con rod.
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