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Overview

The easy choice in sport performance!

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.
  • 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

Specs

Product Specs

Benchmark Prop
8×4 break-in
Bore
0.598″ (15.2mm)
Carb Type
Rotary
Crankshaft Threads
UNF1/4-28 M5
Crankshaft Type
Threaded
Cylinders
Single
Displacement
0.15 cu in (2.49 cc)
Engine (Only) Weight
4.87oz (138g) w/o muffler
Muffler Type
2-piece aluminum
Muffler Weight
1.5oz (42g)
Oil Type & Content
At least 18% synthetic lubricant
Plug Type
O.S. A3
Power Type
Glow
Product Height
2.4″ (61mm) crankcase botton to top of cylinder head
Product Length
2.16″ (56.5mm) from back plate to front of drive washer
Product Width
1.6″ (40mm) at mounting tabs
Prop Range
7×5-6 x 8×4-5
RPM Range
2,500 – 18,000
Stroke
0.539″ (13.7mm)
Weight 5 kg