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  Electric Motors, Engines & Accessories > Engines Glow Fuel > Engines R/C Glow Fuel Aircraft 2-Stroke - .76-1.2 Bookmark this Page

O.S. - OSMG0652 OSM19215 19215 531028022041 4531028022041
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O.S. 120AX Special Engine
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O.S. 120AX Special Engine
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Tower Catalog Page: 199

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Tech Notes
      This is the 120AX Special Ringed Aircraft Engine from O.S. Engines.

FEATURES: High performance two stroke engine designed for sport and scale models Compact size enables it to fit into most cowls Crankshaft port timing was modified to increase power at high RPM Velocity stack on carburetor adds acceleration at high RPM 0.1mm head gasket increases compression ratio for more power 1mm deeper machining to enlarge intake port for greater RPM Two year limited warranty through Hobby Services beginning at date of purchase

INCLUDES: 120AX Special Ringed Aircraft Engine, #8 Glow Plug, 70D Carburetor with Velocity Stack, Instruction Manual, Prop Washer & Nut and Needle Valve Extension Set

REQUIRES: Fuel: Two-Stroke with 18% lubricant and 5-20% nitromethane Muffler: E-5020 "Power Box" Propeller: 15x10-12 or 16x8-10

SPECS: Displacement: 1.218 cu in (19.96 cc) Bore: 1.197" (30.4mm) Stroke: 1.083" (27.5mm) Practical RPM Range: 1,800 - 9,500 Output: 3.35 PS (3.155 HP) @ 9,500 RPM Crankshaft Size: UNF5/16-24 Distance between Mounting Hole Center Same Side: 0.98" (25mm) Distance between Mounting Hole Center Opposite Side: 2.3" (58mm) Height/bottom of Mounting Tab/top of Cylinder Head: 3.4" (85.7mm) Height/bottom of Crankcase/top of Cylinder Head: 4.3" (109.2mm) Length from Backplate to front of Drive Hub: 3.9" (100.2mm) Length from Backplate to end of Crankshaft: 5.5" (139.9mm) Length from Backplate to Center of Crankcase: 1.2" (30.4mm) Length from front of Drive Hub to end of Crankshaft: 1.6" (39.7mm) Width at Mounting Tabs: 2.6" (67mm) Width of Crankcase below Mounting Tabs: 1.8" (46.5mm) Height from Crankshaft Center to Needle Valve: 1.3" (33.8mm) Distance between Muffler Mounting Hole Centers: 1.9" (48mm) Carburetor Settings; Needle Valve, 2 - 2.5 turns out from fully closed as a starting point Mixture Control Valve, Close throttle rotor and screw in Mixture Control Screw until it stops, then unscrew approximately 3/4 turn. NOTE, Mixture Control Valve is factory set and should require only small adjustments. Refer to instruction manual for full break-in procedures.

jxs 06/11/12 ir/jxs

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Accessories Needed
This is the 120AX Special Ringed Aircraft Engine from O.S. Engines. FEATURES: Modified crankshaft port timing & velocity stack on carb for more power at high RPM, compact size fits into greater range of cowls, 0.1mm head gasket for higher compression REQUIRES: Prop, fuel, glow starter, field equipment

Accessories for the O.S. 120AX Special Engine

Primary Accessories   Building & Field Equipment Optional Accessories
  Special Stock Number Product Description Parts Saver Eligible Tower's
Low Price
Click to Order Quantity Needed In Cart? Stock
 LX1608 APC 15x12 Pattern Propeller
Qty Discount Available
11.29   In Stock
 LXK129 Great Planes Silicone Fuel Tubing Standard 3'
Qty Discount Available
2.79   In Stock
 LXK134 Great Planes Ultra Precision Fuel Filter
Qty Discount Available
3.79   In Stock
 LXLPK9 O.S. Muffler Power Box 120AX
Qty Discount Available
58.99   In Stock
 LXRXC4 Tower Hobbies TOWER Power 10% Airplane Fuel Quart
Qty Discount Available
6.69   In Stock
Subtotal for this Group of Accessories: 83.55  
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Primary Accessories   Building & Field Equipment Optional Accessories

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