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     This is the O.S. 12XZ(P) Speed ABC Engine with 12FB Slide Carburetor.

FEATURES: Specially coated silicone filled crankshaft with precision ceramic
            bearing that greatly reduces wear and friction, plus a Tungsten
            weight for added balance at higher RPM
          Meets IFMAR regulations
          Machined aluminum outer head with holes drilled for lighter weight
            and better cooling
          Newly designed crankcase and liner port for increased torque at low
            to mid speed
          New 12F(B) slide valve carburetor designed to match power
            characteristics of engine
          ABC cylinder liner construction, "A"luminum piston with "B"rass liner
            that is "C"hrome plated

INCLUDES: O.S. 12XZ(P) Speed ABC Engine with 12FB Slide Carburetor, 5.5mm
            reducer, RP6 turbo glow plug, exhaust gasket, two dust caps 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: 2.1cc
          Bore: 13.8mm
          Stroke: 14.0mm
          Practical RPM: 5,000 - 44,000
          Power Output: 1.75ps/35,000
          Weight: 8.1oz (230g)
          Height from crankcase bottom to top of cylinder head: 3.54" (90mm)
          Height/crankshaft center to top of cylinder head: 3.01" (76.6mm)
          Width including mounting tabs: 1.53" (39mm)
          Width not including mounting tabs: 1" (25.4mm)
          Width between mounting holes same side: 0.43" (11mm)
          Width between mounting holes opposite side: 1.23" (31.4mm)
          Cylinder head diameter: 1.93" (49mm)
          Length of exposed crankshaft: 1.16" (29.5mm)
          Length from backplate to front bearing: 1.96" (50mm)
          Length from backplate to end of crankshaft: 3.1" (79.5mm)
          Internal thread size at end of crankshaft: 1/4-28
          Carburetor Settings:
            Needle Valve, Approximately 2-1/2 turns open from fully closed
            Throttle Stop Screw, Approximately 1mm visible from carb throat
            Mixture Control Valve: Rotate until slotted head is flush with
              carburetor body
            (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 1/16/09
                                                                         ir/jxs



– If you need more information, use these O.S. resources –

Click Here: Manufacturer's Product Web Page
E-mail: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970


 
Postal Address:
O.S.
3002 N. APOLLO DRIVE, SUITE #1
CHAMPAIGN, IL 61822  








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