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               This is a O.S. 21XM Outboard Marine Engine.
   This is a High-Performance Water-Cooled Marine Engine for Smaller Radio-
   Controlled Boats.

              Due to the high-performance nature of this engine
                     it is NOT covered by any warranty.

FEATURES: Simple construction for easier maintenance translates to more time
            in the water, less time on the bench.
          Comes with pre-installed tiltable mount for adjustable "plane", and
            also comes with a carbon propeller.
          This engine would be suitable to use where a 3.5cc (.21 size) engine
            would be used, even a retrofit to older hull.

REQUIRES: Suitable boat, Fuel, Field Equipment such as Glow Starter, Fuel
            Pump

INCLUDES: One Assembled 21XM Marine Outboard Engine w/Mount, Outdrive Unit,
            Muffler, Water-Cooled Head, Starter Cone, Steering Bracket, and
            #20J Carb.
          One Throttle Linkage Holder (OSMG9065)
          One Water Pick-Up Tubing
          One Fuel Pressure Tubing
          One #8 Glow Plug (OSMG2691)
          One Propeller (OSMG7915)

SPECS:    Displacement: 3.46cc (.211 cu.in)
          Bore:         16.6mm (.654 in.)
          Stroke:       16.0mm (.630 in.)
          Practical RPM: 3,000-25,000 RPM
          Power output: 1.3 Bhp @ 25,000 RPM
          Prop Shaft Size: 3/16"
          Prop size:    D 42mm x P/D 1.2 nylon
          Overall Height: 9"
          Height from Bottom to Water Plane: 3-1/8"
          Height from Plane to Bottom of Transom Mount: 1/2"
          Height from Plane to Steering Control: 2-1/2"

          Needle Settings: High Speed: 2.5 utrns out form fully closed
                           Mixture Control (low speed): Edge of the larger
                                       sleeve centered when looking down the
                                       neck of the carb

COMMENTS: (IMPORTANT) This Engine STARTS AND RUNS IN A CLOCKWISE DIRECTION
            at the starter cone, any attempt to start engine in a
            counter-clockwise rotation may cause serious damage to the engine.
            Because of the clockwise rotation, the crankshaft has reverse
            threads.
          The fuel O.S. recommends is anything with at least 18% or more
            total lubricant, and a nitro content of 10% to 30%. Some fuels
            do not meet these requirements and may damage the engine.
          Glow plugs appropriate for this engine are as follows;
            For 10-20% nitro use a #8 plug (OSMG2691)
            For 20% or greater nitro use a #A5 plug (OSMG2693)
            COMMON REPLACEMENT PARTS: Prop: OSMG7915
                                      Drive shaft: OSMG8080
          This is Not An ABC Engine.
                                                                     4/24/98snm
                                                                  JAL 5/22/98up
                                                                          ir/jl
                                                                   jxs 12/11/03
                                                                updt lmm 4/6/09



– 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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