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.
Features
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Thunder Tiger 9568 PRO .21M OB Gear 1.04:1
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Ideal for 3.5cc Tunnel Hull
Class
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ABC piston and cylinder
construction "A"luminum piston with "B"rass cylinder liner that is "C"hrome
plated
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Automatic mixture control
carburetor
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Schnuerle porting
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Helical gear set transfers
power from crankshaft to flex cable
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Built-in muffler/expansion
chamber incorporated into lower unit
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Reduction gear system
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Adjustable thrust line
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Prather S215 metal propeller
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Blue anodized water cooled
cylinder head
Specifications
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Displacement: .211 cu in
(3.46cc)
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Bore: 0.654" (16.6mm)
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Stroke: 0.630" (16mm)
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Practical RPM: 3,000 - 38,000
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Output: 2.10 BHP/30,000 RPM
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Gear Ratio: 1.04:1
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Weight: 25.39oz (720g)
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Needle Valve: 2 - 2-1/2 turns
counterclockwise from closed
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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
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Pro-21M-OB Engine, Mount, Lower Unit, 2.5, 2, & 3mm hex wrenches,
O-ring and instruction manual
Requirements
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Fuel: At least 20% lubricant
with 5-15% nitro content, fuels containing a blend of both castor and
synthetic oils are best
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Glow Plug: R/C long type such
as the OS #8
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Glow starter and shore
equipment
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