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  Electric Motors, Engines & Accessories > Engines Glow Fuel > Engines R/C Glow Fuel Aircraft 2-Stroke - .20-.39 Bookmark this Page

O.S. - OSMG0525 OSM12660 12660 531028013063 4531028013063
Manufacturer Stock#
12660
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  Tech Notes

Accessories Needed

Replacement & Optional Parts

Regularly Purchased Together

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O.S. 25FX ABL w/Muffler
 
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O.S. 25FX ABL w/Muffler
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Instruction Manuals: Manual 1 (884 KB)
Tower Catalog Page: 200

Stock Number
OSMG0525
Retail Price
199.99
Tower's Low Price
$129.99
FREE shipping when ordering this item on our web site... click for more information
Stock Status
In Stock
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Quantity Discount
  Special Savings When Buying in Quantities
 
Special Stock Number Units at this Price Tower's Low Price Click to Order Quantity Discount Savings
 L5BY4202
O.S. 25FX ABL w/Muffler Add to Wish List
248.28  Buy Now 11.70  

Regularly Purchased Together
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Tech Notes
 
NOTES FROM OUR TECH DEPARTMENT
O.S. has Updated the .25 SF with this New High-Performance .25 FX.
This Engine may be used in Sport and Aerobatic Aircraft. The FX is Designed to
Use a Muffler or Tuned Pipe. Comes with a 2-Year Warranty.

FEATURES

Remote Needle Attached to the Backplate keeps fingers away from prop
Twin Ball Bearing-Supported Crankshaft
Schnuerle Porting (Schnuerle scavenging)
Advanced Bi-Metallic Liner. This process uses a double layer of
plating material, rather than one thicker layer. This helps the
metal to bond to the cylinder, and is more durable. Also, the
plating process is more consistent, resulting in a more precise
fit between piston and sleeve, for better compression, longer life.
Side Exhaust
One-Piece Crankcase

INCLUDES

One Expansion Style Muffler
One Set of Instructions, Decal, and Poster
One Assembled .25 FX w/Carb

SPECIFICATIONS

Displacement: 4.07cc (.2485 cu in)
Bore: 18mm (.708")
Stroke: 16mm (.630")
Horsepower: .84 BHP at 18,000 RPM
Weight: 248g (8.8oz) 10.8oz w/muffler
Length: 75.6mm (2.98") distance from the backplate to drive washer
Width: 30mm(1.18") width of engine neglecting engine mounting flanges
38mm (1.50") distance between centers of the mounting holes
Height: 75.5mm (2.97")
Crankshaft Thread Size: 1/4-28
Recommended Props: Pattern Flying: 9x5, 9x6
Pattern Flying if a tuned pipe is used: 9.5x5
Sport Flying: 9x5, 9x6, 9.5x5, 10x4, 10x5
Practical RPM Range: 2,500 - 19,000 RPM

High Speed Needle: 1.5 - 2 turns out from fully closed
Low Speed Needle: 2mm gap between the needle and spray bar at full
throttle (looking down the neck of the carb)

REQUIREMENTS

Long Glow Plug (O.S. #8 recommended OSMG2691)
Fuel with 18% (minimum) lubricant content and 5%-15% Nitromethane
(All 5%-15% fuels we carry meet these requirements)
ir/jl
updated jpg 9/20/05
updt lmm 3/27/09

– If you need more information, use these O.S. resources –
Click Here: Manufacturer's Product Web Page
Email: 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

Click here for Units of Measure Conversion Calculators

Accessories Needed
 
COMPLETION NOTES FROM THE TECH DEPARTMENT
THIS IS A .25 AIRPLANE ENGINE. STARTING EQUIPMENT IS IN AIRPLANE ACG. COMES WITH MUFFLER (WITH PRESSURE FITTING) AND REMOTE NEEDLE VALVE. REQUIRES FUEL, FUEL FILTER, PROP, ENGINE MOUNT, AND GLOW PLUG.

Accessories for the O.S. 25FX ABL w/Muffler

Primary Accessories     Optional Accessories
 
  Special Stock Number Product Description Parts Saver Eligible Tower's
Low Price
Click to Order Quantity Needed In Cart? Stock
Status
 LXB870 Dave Brown Engine Mount .20-.25
Qty Discount Available
3.79   In Stock
 LXK134 Great Planes Ultra Precision Fuel Filter
Qty Discount Available
3.79   In Stock
 LXHY22 Top Flite 10x4 Power Point Propeller
Qty Discount Available
2.49   In Stock
 LXJA89 Tower Hobbies TOWER Power Glow Plug
Qty Discount Available
5.99   In Stock
 LXRXC4 Tower Hobbies TOWER Power 10% Airplane Fuel Quart
Qty Discount Available
9.69   In Stock
Subtotal for this Group of Accessories: 25.75  
Click to Order all items listed in this Group of Accessories    Buy This group of Accessories

Primary Accessories     Optional Accessories

 
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