OS Motors .15LA Non-Ring 10G Carb 871 Muffler

Updated on Jun 16, 2026 04:30:39 AM

This is the O. S. Max .15LA Engine with Muffler.
Meets requirements of beginners and sport flyers.
*** TWO YEAR LIMITED WARRANTY ***


FEATURES:
One-Piece natural finish crankcase
Non-ringed cylinder construction
Two Bronze Crankshaft Bushings (sometimes called oilite bearings)
Schnuerle Porting (Schnuerle scavenging)
Side Exhaust
Nylon Backplate with Remote Needle Valve
#10G carb with remote needle valve assembly


INCLUDES:
Expansion-Style Muffler #871
.15LA Engine w/Carb
Instructions, Decal Sheet, and Warranty Card
Two 2.6x23mm screws to bolt muffler to engine
1.5 inch length of fuel tubing for remote needle valve
One #A3 glow plug


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. Nickel-Plated
    Brass Cylinder
Displacement: 2.49cc (0.1517 cu. in.)
Bore: 15.2mm (.598")
Stroke: 13.7mm (.539")
Horsepower: .41 PS, 0.40 HP at 17,000 RPM
Weight: 5 oz w/o muffler (6.5 oz w/muffler)
Length: 56.5mm (2.16") distance/backplate to front of drive washer
76.5mm (3.01") distance from backplate to prop adapter
Width: 24.8mm (1.0") 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: 61mm (2.42")from bottom of mounting tab/top of cylinder head
Crankshaft Thread Size: 5mm
Recommended Props: Break In: 8X4
Trainer and Sport Models: 7X5-6, 8X4-5
Practical RPM Range: 2,500 - 18,000 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.


COMMENTS:
This engine will work well with any of the following glow plugs: A3,
    A5, or A8.




BOX DIMENSIONS: 4.88" W. X 3.13" H. X 5.00" L.
BOX WEIGHT: .65 LBS.