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Thunder Tiger 9568 PRO .21M OB Gear 1.04:1

Thunder Tiger 9568 PRO .21M OB Gear 1.04:1
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Item #:9568

Thunder Tiger 9568 PRO .21M OB Gear 1.04:1

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


  • Thunder Tiger 9568 PRO .21M OB Gear 1.04:1

  • 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


  • 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

Package Contents

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


  • 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


  • N/A.

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