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Thunder Tiger - TTRG0121 TTR9567 9567 719523591327 4719523591327
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Thunder Tiger PRO .21M Outboard Marine 1.19:1 Engine
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Thunder Tiger PRO .21M Outboard Marine 1.19:1 Engine
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Instruction Manuals: Manual 1 (6.6 MB)

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Mid Dec

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Tech Notes
This is the Thunder Tiger Pro-21M-OB Outboard Marine Engine
with 1.19:1 Gear Ratio.


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


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


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: 1.19:1
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

jxs 10/28/10

– If you need more information, use these Thunder Tiger resources –
Click Here: Manufacturer's Product Web Page
Email: productsupport@hobbico.com
Web Site: http://www.ttamerica.com/
Phone: 217-398-8970
  Postal Address:
Thunder Tiger
3002 N. Apollo Drive, Suite #1
Champaign, IL 61822

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Accessories Needed
This is the Thunder Tiger Pro-21M-OB Outboard Marine Engine. FEATURES: Ideal for 3.5cc Tunnel Hull Class, ABC piston & liner, adjustable thrust line, reduction gear system, engine height adjustment, Prather S215 metal propeller, integrated expansion chamber/muffler REQUIRES: Fuel w/20% lubricant, 5-15% nitro content, glow plug, shore equip.

Accessories for the Thunder Tiger PRO .21M Outboard Marine 1.19:1 Engine

Primary Accessories   Building & Field Equipment Optional Accessories
  Special Stock Number Product Description Parts Saver Eligible Tower's
Low Price
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 LXD531 Duratrax Kwik-Pit 250cc Fuel Bottle
Qty Discount Available
5.99   In Stock
 LXJA89 Tower Hobbies TOWER Power Glow Plug
Qty Discount Available
5.99   In Stock
Subtotal for this Group of Accessories: 11.98  
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Primary Accessories   Building & Field Equipment Optional Accessories

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