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  O.S. Engines .21XZ-M Marine Engine Speed 3.5cc Inboard OSM13952

OSM13952 O.S. Engines .21XZ-M Marine Engine Speed 3.5cc Inboard

List Price: $719.99
Our Price: $449.99
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Stock Status:

 In Stock

Product Code: OSM13952

Technical Specs
This is the O.S. Engines 12XZ Speed Spec III Glow Powered Touring Car Engine.


  • Tapered surface on piston with a depression that works with the head button to maximize combustion and power
  • Redesigned 12F2 (B) slide valve carburetor delivers sharp acceleration and instant throttle response with easier more reliable tuning
  • Outer head sits 0.24" (6mm) lower over the crankcase decreasing the engine's weight, lowering the CG and aiding in cooling
  • Redesigned head button for better performance and improved acceleration
  • Slightly thicker cylinder liner with redesigned ports for better air/ fuel flow that boosts mid-speed torque and extends fuel mileage
  • DLC coating on crankshaft with pressed in Tungsten weights and ceramic rear ball bearing

One O.S. Engines 12XZ Speed Spec III Glow Powered Touring Car Engine, with 12F2(B) Slide Valve Carburetor, RP6 Glow Plug, Exhaust Seal Ring, Dust Cap Set, 5.5mm Red Carb Reducer and an Instruction Manual

Fuel: 10-30% nitro content, 20% recommended for break-in
Exhaust System: Depending on vehicle
Air cleaner assembly, glow starter and track equipment

Note: Because of the expressed racing nature of this engine, it is NOT covered by the O.S. 2 Year Warranty per page 8 of manual.

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