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O.S. .21XZ-M 3.5cc Inboard Marine 13951

O.S. .21XZ-M 3.5cc Inboard Marine 13951
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Item #:139510

O.S. .21XZ-M 3.5cc Inboard Marine 13951

This is the O.S. 21XZ-M 3.5cc Inboard Marine Engine.

****** Because of the competition nature of this engine,******

******it is NOT covered by the O.S. 2 Year Warranty.******


  • O.S. .21XZ-M 3.5cc Inboard Marine 13951

  • Designed expressly for 21 class boat racing

  • 21D big bore carburetor allows use of high nitro fuel

  • Blue anodized water cooled head


  • Displacement: .21 cu in (3.5cc)

  • Bore: 0.640" (16.27mm)

  • Stroke: 0.661" (16.8mm)

  • Practical RPM: 4,000 - 45,000

  • Power Output: 2.75 hp (33,000RPM)

  • Crankshaft Size: 1/4-28

  • Carburetor Settings:

  •   Needle Valve; 1.5 turns from fully closed

  •   Mixture Control Valve: Turn clockwise 10� to lean mixture or counterclockwise to richen mixture, adjust in steps of no more than 45-90�

  • Distance between mounting hole centers same side: 0.83" (21mm)

  • Distance between mounting hole centers opposite side: 1.4" (37mm)

  • Distance/mounting tab to center of exhaust: 1.1" (28.5mm)

  • Distance/mounting tab to center of cooling inlet: 2.2" (55.6mm)

  • Distance from exhaust center to mounting flange bottom: 1.1" (28.5mm)

  • Width not including mounting flanges: 1.2" (31.6mm)

  • Width including mounting flanges: 1.8" (45mm)

  • Height bottom of crankcase to top of intake:

  • Height bottom of mounting flanges to top of intake: 2.6" (66.1mm)

  • Length from backplate to end of crankshaft: 3.4" (86.5mm)

  • Length from backplate to front bearing: 2.5" (64.5mm)

  • Length from crankcase center to front bearing: 1.7" (44mm)


  • O.S. 21XZ-M 3.5cc Marine Engine with 0.2mm Head Gasket, Silicone Exhaust Seal, RP7 Turbo Glow Plug, two Dust Caps and Instructions


  • Glow Fuel: Boat blend with 10-30% nitromethane content, use 20% for break-in

  • Exhaust system depending on boat

  • Glow plug igniter

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