O.S. 21XZ-R On Road ABC Engine
New from O.S. Engines, the .21XZ-R On-Road ABC engine is designed to take drivers to victory at major 1/8 scale on-road championship races. The tungsten-weighted crankshaft creates optimum balance for consistent low and mid-speed torque while the cylinder liner features 7 scavenger ports and 3 exhaust ports for more efficient combustion. Other improvements over its predecessor include a newly designed 21M carburetor, a lighter piston and a more durable conrod.
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