This is the Thunder Tiger Pro-21M-OB Outboard Marine Engine
                            with 1.04:1 Gear Ratio.

FEATURES: Ideal for 3.5cc Tunnel Hull Class
          ABC piston and cylinder construction "A"luminum piston with "B"rass
            cylinder liner that is "C"hrome plated
          Automatic mixture control carburetor
          Schnuerle porting
          Helical gear set transfers power from crankshaft to flex cable
          Built-in muffler/expansion chamber incorporated into lower unit
          Reduction gear system
          Adjustable thrust line
          Prather S215 metal propeller
          Blue anodized water cooled cylinder head

INCLUDES: Pro-21M-OB Engine, Mount, Lower Unit, 2.5, 2, & 3mm hex wrenches,
            O-ring and instruction manual

REQUIRES: Fuel: At least 20% lubricant with 5-15% nitro content, fuels
            containing a blend of both castor and synthetic oils are best
          Glow Plug: R/C long type such as the OS #8
          Glow starter and shore equipment

SPECS:    Displacement: .211 cu in (3.46cc)
          Bore: 0.654" (16.6mm)
          Stroke: 0.630" (16mm)
          Practical RPM: 3,000 - 38,000
          Output: 2.10 BHP/30,000 RPM
          Gear Ratio: 1.04:1
          Weight: 25.39oz (720g)
          Needle Valve: 2 - 2-1/2 turns counterclockwise from closed
          Mixture Metering Screw: After setting needle valve, 1/8 turn
          clockwise if mixture is too rich or 1/8 turn counter-clockwise if
          mixture is too lean- initial setting 3.5 turns out from fully closed

                                                                   jxs 10/28/10
                                                                         ir/jxs