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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.

Specifications
Displacement: .213 ci (3.49cc)
Bore: .640 in (16.27mm)
Stroke: .661 in (16.8mm)
Practical RPM: 4,000 – 45,000 rpm
Power Outlet: 2.7 hp/33,000 rpm
Weight: 12.32 oz (348g)
Available: Late October
Source: OS Engines (http://www.osengines.com/) [osengines.com]
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