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Tower Catalog Page:	194
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         This is the the O.S. Max .25LA Aircraft Engine with Muffler.
              Meets Requirments of Beginners and Sport Flyers.
                        *** TWO YEAR LIMITED WARRANTY ***

FEATURES: One-piece natural finish crankcase
          Two bronze crankshaft bushings (sometimes called Oilite bearings)
          Schnuerle porting (Schnuerle scavenging)
          Side exhaust
          Nylon backplate
          #20H carb with remote needle valve assembly

INCLUDES: Expansion-Style Muffler #E-2030
          .25LA Engine w/Carb and A3 glow plug
          Instructions, mount template, decal sheet
          Two 3x27mm screws to bolt muffler to engine

REQUIRES: Glow Fuel with 5-15% Nitromethane and 20% (minimum) lubricant content
          Glow starter, plug wrench and field equipment

SPECS:    Construction: Aluminum 1-piece crankcase, piston, cylinder head,
            crankshaft, connecting rod, and crankshaft. Chrome-plated
            Brass cylinder.
          Displacement: 4.07cc (0.249 cu. in.)
          Bore:       18.0mm (.709")
          Stroke:     16.0mm (.630")
          Horsepower: 0.6 BHP at 15,000 RPM
          Weight: 7.0oz w/o muffler (9.5oz w/ muffler)
          Length: 67.5mm (2.65") distance/backplate to front of drive washer
                  89.5mm (3.52") distance from backplate to prop adapter
          Width: 29mm (1.14") width of engine neglecting mounting flanges
          Distance Between Mounting Holes Same Side: 14.4mm (.56")
          Distance Between Mounting Holes Opposite Side: 33mm  (1.29")
          Height: 74.5mm (2.93") from bottom of mount tab/top of cylinder head
          Crankshaft Thread Size: 1/4-28
          Recommended Props: Break In: 9x5
             Trainer and Sport Models: 9x5, 9x6
          Practical RPM Range: 2,500 - 16,000 RPM

          High Speed Needle: 1.5 turns out from fully closed
          Low Speed Needle:  Tip of the needle half way across the small hole
                             in the FRONT of the carb body.
                                                                    tlw 6/22/07
                                                                         ir/jxs
                                                               updt lmm 3/27/09



– If you need more information, use these O.S. resources –

E-mail: 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  








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