O.S. Engines .12XZ Touring Car Engine Speed Spec III OSM11685
OSM11685 O.S. Engines .12XZ Touring Car Engine Speed Spec III

O.S. Engines .12XZ Touring Car Engine Speed Spec III OSM11685

reg $699.99
$449.99

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

Features:
  • 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

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

Requires:
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.
Displacement: 0.128 cu in (2.1cc)
Bore: 0.543" (13.8mm)
Stroke: 0.55" (14.0mm)
Practical RPM Range: 5,000-44,000
Output: 1.73hp @ 35,000 RPM
Weight: 7.9oz (225g)
Height from crankcase bottom to top of cylinder head: 3.2" (82mm)
Height/crankshaft center to top of cylinder head: 2.7" (68.7mm)
Width including mounting tabs: 1.5" (39mm)
Crankcase width below mounting tabs: 1.02" (26mm)
Width between mounting hole centers same side: 0.43" (11mm)
Width between mounting hole centers opposite side: 1.2" (31.4mm)
Mounting hole diameter: 0.12" (3mm)
Cylinder head diameter: 1.9" (49mm)
Length from end of crankshaft to front bearing: 1.2" (29.5mm)
Length from backplate to front bearing: 2.1" (52.6mm)
Length from backplate to end of crankshaft: 3.2" (82.1mm)
Crankshaft Size: 1/4-28

Carburetor Settings
Needle Valve: 2.5 turns open from fully closed
Throttle Stop Screw: 0.5mm open
Mixture Control Valve: follow break-in procedure and turn clockwise 15? to lean mixture or counterclockwise 15 degrees to richen mixture

Note: Make adjustments only in small increments. Refer to manual for full break-in and carburetor adjustment instructions.

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