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  Electric Motors, Engines & Accessories > Engines Glow Fuel > Engines R/C Glow Fuel Car 2-Stroke - .0 -.15 Bookmark this Page

O.S. - OSMG1992 OSM11685 11685 531028022201 4531028022201
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Easy RC: Engines

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O.S. 12XZ Speed Spec III Engine
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O.S. 12XZ Speed Spec III Engine
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Tower Catalog Page: 202

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Late Apr

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

****** 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. ******

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

INCLUDES: 12XZ Speed Spec III Engine, with 12F2(B) Slide Valve Carburetor, RP6 Glow Plug, Exhaust Seal Ring, Dust Cap Set, 5.5mm Red Carb Reducer and 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

SPECS: 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) Crankcaase 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 to richen mixture (Make adjustments only in small increments. Refer to manual for full break-in and carburetor adjustment instructions)

COMMENTS: Some notes on Slide Valve and Rotary Carburetors: Rotary Carbs offer a larger response in the middle of the power band. This works well for off-road applications when throttle response must be varied. Slide Valve Carbs provide greater response at the beginning and end of the power band. This works well for on-road and racing applications for fast take-offs and high speed.

jxs 12/31/12 ir/jxs

– If you need more information, use these O.S. resources –
Click Here: Manufacturer's Product Web Page
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Phone: 217-398-8970
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Accessories Needed
This is the O.S. 12XZ(P) Speed Spec III On-Road Engine. FEATURES: DLC coated, silicone filled crankshaft with tungsten weight & ceramic rear bearing, 12F2(B) slide valve carburetor REQUIRES: Fuel and track equipment, exhaust system depending on vehicle

Accessories for the O.S. 12XZ Speed Spec III Engine

Primary Accessories   Building & Field Equipment Optional Accessories
  Special Stock Number Product Description Parts Saver Eligible Tower's
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 LXRXC9 Tower Hobbies TOWER Power 20% Car Fuel Quart
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7.69   In Stock
Subtotal for this Group of Accessories: 7.69  

Primary Accessories   Building & Field Equipment Optional Accessories

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