Why burn daylight fiddling with a finicky motor? Take the easy way out, with an engine that's as powerful and dependable as the day is long: LA-Series engines from O.S. are flier favorites because they are easy: easy to afford, easy to run, easy to maintain — and hard to beat for powerful, dependable performance. That's because O.S. has worked hard to make them that way. With CNC-machined parts, for precise fit and finish. Heavy “webbing” on one-piece crankcases to resist distortion and prevent binding. A tall heat sink head and crankcase fins so LA engines cool better and last longer. And with nylon backplates that include an integral, molded-in fuel inlet and needle-valve holder.

 

 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

REQUIREMENTS

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

SPECIFICATIONS

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.