O.S. FS155-a Alpha Series 1.55 4-Stroke Pumped Engine

Tower Stock# LXARVT  •  Manufacturer Stock# 35430
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Notes from our tech department:
This is the FS155-a P Four Cycle Engine with Pump System from O.S. Engines.


Ideal for 120 size scale and sport models and aerobatic models
requiring stable power and linear throttle response
PD-08 pump and 70R carburetor integrated with regulator ensures
stable fuel delivery regardless of model attitude and fuel level
F-6020 three piece design muffler with center heatsink
New internal lubricating system eliminates breather tubing from the
Two year limited warranty through Hobby Services beginning at date of


FS155-a P Four Cycle Engine with PD-08 Pump System, 70R Carburetor
F-6020 Muffler, Header Pipe, type F Glow Plug, Needle Valve
Extension Cable, Instruction Manual


Fuel: Glow fuel with 5-20 nitro content and no less than 18
lubricant content
Propeller: 16x8-12 or 17x8-12
Glow Starter
Field equipment


Displacement: 1.548 cu in (25.36cc)
Bore: 1.323 (33.6mm)
Stroke: 1.126 (28.6mm)
Practical RPM: 2,000 - 10,000 RPM
Power Output: 2.6 PS, 2.56 HP 10,000 RPM
Engine Weight: 28.40 oz (805g)
Muffler Weight: 3.35oz (95g)
Carburetor Settings-
Needle Valve: 2-12 - 3 turns from fully closed
Mixture Control Valve: Factory set, make only small adjustments if
needed, after adjusting needle valve as described in manual, turn
30 to lean idle mixture or 90 counterclockwise to richen mixture
then back again 45 clockwise

Width at Mounting Tabs: 2.6 67mm)
Crankcase Width below Mounting Tabs: 1.8 (47mm)
Length from Drive Washer to rear of Carburetor: 5 (127.5mm)
Height from Mounting Tab to Pushrod Cover: 4.5 (114mm)
Height from bottom of Crankcase to Pushrod Cover: 5.4 (138.6mm)
Distance between Mounting Hole Centers Same Side: 0.98 (25mm)
Distance between Mounting Hole Centers Opposite Side: 2.3 (58mm)
Distancefront Mounting Hole Center to Drive Washer: 2.5 (64.5mm)
Distance Center of Engine to Drive Washer: 3.03 (77mm)
Crankshaft Size: 516-24

jxs 021511



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