O.S. 25LA-S Control Line ABN w/Muffler

Tower Stock# LXPUE2  •  Manufacturer Stock# 12361
O.S. 25LA-S Control Line ABN w/Muffler (large view)
Notes from our tech department:
This is the O.S. Max .25LA-S Natural Finish
Control Line Engine with Muffler.


LA-S series engines Control Line engines replace the Carburetor with
a Venturi that keeps the engine running at a constant speed
Remote Needle Valve reduces chance of injury from spinning props
Nylon backplate mount and ratchet spring help hold settings against
"creep" caused by vibration
An O-ring helps seal the needle from fuel and air leaks
Heavy-duty webbing reinforces the one-piece crankcase in high stress
TWO YEAR WARRANTY against manufacturing defects in parts and workman-


One .25LA-S Control Line Engine with #E-2030 Muffler
Two 2.5 x 24mm Phillips head muffler mounting screws
#A3 Glow Plug (OSMG2690)
Decal Sheet
Instruction Manual


Fuel: 10% to 20% Nitro and 18% lubricant content is recommended
Prop: Break in: 9x6
Aerobatic and Sport: 9x6, 10x5


Displacement: 4.07cc (.249 cu in)
Bore: 18mm (.709")
Stroke: 16mm (.630")
Output: 0.6 PS, 0.59 HP @ 15,000 RPM
Practical RPM: 2,000 - 16,000 RPM
Weight: 185.5g (6.54oz)
Crankshaft size: 1/4-28
Distance between mounting tabs: 1.89" (48mm)
Distance between mounting holes on opposite side: 1.46" (37mm)
Distance between mounting holes on same side: .59" (15mm)
Width of crankcase below mounting tabs: 1.10" (28mm)
Height from bottom of crankcase to top/cylinder head: 2.93" (74.4mm)
Length from end of crankshaft to backplate: 3.43" (87.1mm)

Needle Settings: High Speed: 1.5 turns out from fully closed
Mixture Control (low speed): Tip of the needle half
way across the small hole in the front
of the carb
tlw 6/22/07
updt lmm 4/6/09

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