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O.S. Engine 21XZ-R Engines

O.S. Engine 21XZ-R Engines

O.S. introduces two new 21XZ-R engines designed to overthrow the status quo in 1/8 scale on-road racing! Both can run a full 10-minute heat on just one tank of fuel, while most other engines need two tanks. That puts the 21XZ-R driver a pit stop ahead of the pack — and in sole possession of the lead to the checkered flag.

Engineered for added horsepower and faster lap times, the 21XZ-R Speed wowed the crowd at the 1/8 Scale On-Road Worlds in Miami, Florida. Team drivers turned in 4th and 5th place finishes with production models.

  • Redesigned crankcase and carb produce smoother transitions and higher speeds
  • The 21M slide-valve carb features 4 adjustable control settings, including a low-end metering needle for improved torque and fuel economy
  • A more-balanced conrod reduces vibration and wear

Specifications:

Displacement: 3.49 cc (.212 ci)
Bore: 16.27 mm (.640 in)
Stroke: 16.8 mm (.661 in)
Practical RPM: 4,000 to 45,000
Power Output: 2.8 ps/2.84 hp/33,000 rpm
Weight: 338 g (11.9 oz)


Equipped with many of the same performance features as the .21XZ-R Speed ABC, the 21XZ-R VII offers explosive acceleration and top-end for race-winning potential at a more economical price.

  • Combines aggressive timing with easy starting so drivers can unleash its race-winning potential right out of the box
  • The cylinder liner boasts 7 scavenger ports and three exhaust ports

Specifications:

Displacement: 3.49 cc (0.213 ci)
Bore: 16.27 mm (.640 in)
Stroke: 16.8 mm (.661 in)
Practical RPM: 4,000 to 45,000
Power Output: 2.8 ps/2.84 hp/33,000 rpm
Weight: 343 g (12.1 oz)

OSMG2041 .21XZ-R Speed ABC $499.99
OSMG2042 .21XZ-R VII On-Road $399.99

Both O.S. engines will be available early August.

Updated: July 20, 2015 — 5:27 PM

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  1. And they say nitro is dying. NITRO4EVER!

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