O.S. FS155-A P Ring 70R F6020

This is an O.S FS155-A Alpha Series 1.55 4-Stroke Pumped Engine. 200-size power in a 120-size package!

How do you get 200-size power from a 120-size engine? O.S. calls it the FS155-a. Since the FS155-a is a pumped 4-stroke, you’ll enjoy 2.6 hp at all times, regardless of tank position, attitude or fuel level. Its novel re-circulation system bathes working parts in constant lubrication, for less friction and wear!

 

• 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
• Redesigned internal lubricating system eliminates breather tubing from the
• crankcase

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)

Needle Valve: 2-1/2 – 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)

Distance between Mounting Hole Centers Same Side: 0.98″ (25mm)

Distance between Mounting Hole Centers Opposite Side: 2.3″ (58mm)

Distance/front Mounting Hole Center to Drive Washer: 2.5″ (64.5mm)

Distance/ Center of Engine to Drive Washer: 3.03″ (77mm)

Crankshaft Size: 5/16-24

Includes:

• 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: 16×8-12 or 17×8-12
• Glow Starter
• Field equipment