O.S. Engines FF-320 Pegasus 4-Cyl Ringed 4-Stroke OSM36410

Back Order Now
You may back order this item and it will ship when it arrives.
FREE Shipping Eligible! Learn More
Price: $2,999.99

Please Log in to receive a notification when this item arrives in stock.

Save In List
This item earns up to 3000 VIP Reward Points Learn More

O.S. Multi-Cylinder 4-Stroke engine has pushrod-driven overhead valves.Ringed pistons. Gear-driven camshaft. 5 -crankshaft ball bearings. 2 -camshaft ball bearings. Four cylinders (flat, 2 opposing 2). Firing Order: 1-3-4-2. This product includes one assembled FF-320 4-stroke engine. One set of instructions, decals and poster. One choke valve. Four glow plugs. One motor mount. One safety prop nut assembly. One glow plug extension harness. One spare woodruff key.

Requires: 2-STROKE Fuel with 5%-15% nitromethane and 16% MINIMUM oil content. (All 5%-15% fuels we carry meet these requirements). DO NOT USE 4-STROKE FUELS!!)


Construction: All aluminum and Aluminum alloys
Displacement: 13.26 cc (x4) (.809 cu in x4)
Bore: 27.7mm (1.091")
Stroke: 22.0mm (.866")
Power Output: 4.1 BHP at 8,000 RPM
Weight: 2,190g (77.3oz) w/mount
Practical RPM Range: 1,800 - 8,500 RPM
Length: 181.5mm (7.15") from back of mount to front of drive washer
Width: 196mm (7.72")
Height: 80mm (3.15") from top of mount to bottom of mount. the carb extends 30-40mm farther down.
Distance from front-most edge of front header to drive washer: 36mm
Crankshaft Thread size: 5/16-24
Suggested Props: 18x10, 18x11, 18x12, 18x13, 18x14, 20x8, 20x9, 20x10, 22x8

Needle Settings
High Speed: 3-3.5 turns out from fully closed
Mixture Control (low speed): Turn counter-clockwise until it stops, then 2 turns out

This product was added to our catalog on April 19, 2017