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O. S. Engine 21XZ-M Speed Inboard Marine Engine

O. S. Engine 21XZ-M Speed Inboard Marine Engine

This new engine is designed after the popular O.S. 21XZ-R engine for 1/8 scale on-road racing and is the perfect upgrade for your nautical ride. Check out all the features in the press release below:

The O. S. 21XZ-M Speed Inboard Marine Engine has the power to make any boat a bona fide competitor on the water. It’s the first Speed-Tuned marine engine in O.S. history, and it’s designed with many of the same features found in the popular O.S. 21XZ-R engine for 1/8 scale on-road racing.

  • A 21D big-bore carb allows the use of high-nitro fuels
  • The crankshaft features DLC (Diamond-like Coating), plus tungsten weights to minimize vibration and silicone inserts to smooth fuel/air flow.
  • The water-cooled head is laser-engraved with a special logo
  • The crankcase features a black-anodized coating for added cooling


Displacement: 0.213 cu in (3.49 cc)
Bore: 0.641 in (16.27 mm)
Stroke: 0.661 in (16.8 mm)
Practical RPM: 4,000-45,000
Output: 2.76 hp @ 33,000 rpm
Weight: 10.85 oz (307.5 g)
Includes: RP7 Plug, exhaust seal ring, dust cap & head gasket sets

The O.S. 21XZ-M will be available late December.

OSMG1622 – 21XZ-M Speed Inboard Marine Engine – $449.99

If you like this article, check out this additional article on O.S. Engine.

Updated: November 30, 2012 — 10:02 AM
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