O.S. 75AX ABL w/Muffler

Tower Stock# LXRPD2  •  Manufacturer Stock# 17400
O.S. 75AX ABL w/Muffler (large view)
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Notes from our tech department:
This is the O.S. Max 75 AX ABL Aircraft Engine with Muffler.


Same mounting dimensions as the O.S. Max .61FX
Advanced Bi-Metallic Liner process uses a double layer of plating
material rather than one thick layer. This helps the metal bond to
the cylinder and makes the plating more durable. Also, the plating
process is more consistent, resulting in a more precise fit between
piston and sleeve for better compression and longer life.
Power Box muffler design provides more volume for increased power in
a very compact shape
Angular head design offers increased surface area for better cooling
Ball bearing-supported crankshaft
61A carburetor with diagonally placed needle valve eliminating
remote needle valve placement
Two year limited warranty


O.S. Max 75 AX ABL Aircraft Engine with E3010 muffler, carburetor,
#8 glow plug, illustrated instruction manual


Aircraft blend fuel containing 5%-20% Nitromethane with at least 18%


Displacement: 0.75 cu in (12.3cc)
Bore: 1.02" (25.8mm)
Stroke: 0.93" (23.5mm)
Practical RPM: 2,000-16,000 RPM
Power Output: 2.4 PS, 2.37HP/15,000 RPM
Weight: 20.39 onuces (578g) w/o muffler
26.46 ounces (750g) w/ muffler
Recommended Props: 14x6, 14x8, 15x7
Crankshaft thread size: 5/16-24
Distance from center of engine to drive hub: 2.62" (66.6mm)
Distance between exhaust bolt mounting holes 42mm
Height from crankcase bottom to top of cylinder head: 4.07" (103.5mm)
Height/crankshaft center to top of cylinder head: 3.20" (81.5mm)
Width including mounting tabs: 2.4" (61mm)
Width not including mounting tabs: 1.67" (42.6mm)
Width between mounting holes same side: .98 (25mm)
Width between mounting holes opposite side: 2.04" (52mm)
Diameter of muffler body: 1.92" (48.8mm)
Angle of muffler in relation to engine: 4
Length from end of crankshaft to back of crankcase 5.09" (129.5mm)

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)

jxs 4/12/07
updated jpg 7/11/07

See Tower Catalog page 173.
Easy RC: Engines
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