O.S. Engines

21XZ-M Inboard Marine

Race-winning performance for inboard modelers!

Based on the race-proven 21XZ-R, the 21XZ-M Inboard Marine delivers the same winning performance for boaters! The crankshaft is silicone-filled for more efficient intake. Also features a water-cooled cylinder head, RP7 Turbo glow plug and more!

Displacement: 0.21 cu in (3.5 cc) Output: 2.75 hp (33,000 rpm) RPM Range: 4,000-45,000 Bore: 0.640 in (16.27 mm) Stroke: 0.661 in (16.8 mm) Requirements: Boat blend glow fuel with 10-30% nitromethane content (use 20% for break-in), Exhaust system (depending on boat), Glow plug igniter Please note: because of the competition nature of this engine, it is not covered by the O.S. 2-year limited warranty.

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