O.S. Engines 21XZ-R Competition On-Road Engine w/21M Carburetor

This is the O.S. Engines 21XZ-R Competition On-Road Engine with 21M Carburetor. Packed with performance features for on-road domination 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.

Features:

• Tungsten-weighted crankshaft creates optimum balance for consistent low- and mid-speed torque.
• ABC Cylinder/Sleeve Construction
• The cylinder liner features 7 scavenger ports and 3 exhaust ports for more efficient combustion.
• The crankcase and 21M carburetor are newly designed.
• Lighter piston.
• More durable con rod.
  

Specifications:
Displacement: 0.284 cu in (4.65 cc)
Bore: 0.728 in (18.5 mm)
Stroke: 0.681 in (17.3 mm)
Practical RPM: 4,000-38,000
Power Output: 3.31 hp @ 32,000 rpm
Weight: 13.1 oz (375 g)

This product was added to our catalog on January 8, 2010