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               This is the O.S. .21 VZ-B V-Spec Pro Modified
                 Racing Engine with Aluminum Heat Sink Head.

   **Additional Technical Info Will Be Added When It Becomes Available.**

FEATURES: V-shaped aluminum head with eight machined holes for lighter
            weight and more efficient cooling
          Piston and liner hand selected and matched for a better fit, more
            power throughout the band and much smoother acceleration
          Specially coated silicone filled crankshaft with precision ceramic
            rear bearing that greatly reduces friction, plus a Tungsten weight
            for added balance
          Slide Valve Carb with 7mm carb restrictor with red
            anodized finish allow tuning to specific track conditions, Low-
            end Needle adjusts from side to side for maximum adjustment ease

INCLUDES: O.S. .21 VZ-B V-Spec Pro Modified engine, 21J carburetor,
             7mm carb restrictor, manual, exhaust gasket and
            dust cap set

REQUIRES: #203 Air Cleaner Assembly, OSMG2360
          Exhaust System: T-2050SC WN MP Silencer Set (OSMG2969)
          Glow Plug: Medium heat range, turbo type
          Fuel: 10-30% nitro content, 20% recommended for break-in
          Most of the fuels we carry meet or exceed the lubricant content
            required for optimum performance and maximum engine life. In the
            past, the conventional lubricant content used in fuel was 18%. But
            with new advanced technologies, fuels like Red Alert and O'Donnell
            for example, have a better quality of lubricants even though the
            percentages of lubricant content are lower. These high-tech
            lubricants provide exceptional cooling and protection.

SPECS:    Practical RPM Range:
          Output:
          Displacement: 0.211 cu in (3.46cc)
          Bore:
          Stroke:
          Weight w/o Muffler:
          Height from crankcase bottom to top of cylinder head:
          Height/crankshaft center to top of cylinder head:
          Width including mounting tabs:                           45mm (1.8")
          Width not including mounting tabs:                     30.8mm (1.2")
          Width between mounting holes same side:                  21mm (.83")
          Width between mounting holes opposite side:              37mm (1.5")
          Cylinder head diameter:
          Length of exposed pilot shaft/crankshaft:
          Internal thread size at end of crankshaft:

COMMENTS: Turbo glow plugs do not require a copper gasket.
          With the carb restrictor, the driver can select either
            low fuel consumption or high power, allowing a wide range
            of engine control. Usage is as follows:
            7mm:  Suitable for technical (narrow) and bumpy course when
            less fuel consumption is more important.

          NEEDLE SETTINGS: These are pre-set from the factory and require
            little or no adjustment
          High Speed - 3 turns out from fully closed
          Throttle Stop Screw - 1/2 turn out from fully closed
          Mixture Control Valve (low speed) - Flush with indentation on screw
                            head pointing at 2:00

                                                                   jxs 01/05/09
                                                               updt lmm 4/14/09



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

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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