Allyn Sea Fury

Allyn Sea Fury

The engine of the Allyn Sea Fury .049 outboard motor is based on the Allyn Sky Fury aero engine, with most parts being interchangeable. However, the crankshaft is a notable exception, as it is timed to rotate in a clockwise direction and features a drive pin on its crankpin.

Allyn Sea Fury .049 outboard motors were manufactured from the mid-1950s until the mid-1960s. Power is transmitted from the engine of the Allyn Sea Fury .049 outboard motor to a short stainless steel propeller shaft via a 3/32" diameter stainless steel drive shaft and 1:1 ratio alloy bevel gears, causing the 7/8" by 7/8" cast aluminium alloy propeller to rotate at the same rpm as the engine.

Since the Allyn Sea Fury .049 outboard motor lacks a throttle, it should only be started under load to prevent the engine from severely over-revving and risking damage. If starting the motor out of water is necessary, the needle valve should be opened approximately 2.5 turns more than its usual setting when the propeller is submerged in water and under load.

It is worth noting that early in the production of the Allyn Sea Fury .049 outboard motor during 1955, K&B merged with and bought out Allyn; while the Allyn name was retained, for a period of time the motor was marketed as the K&B Sea Fury .049 outboard motor.

Capacity: 0.048 cu in (0.784 cc) - Bore: 0.390 in (9.91 mm) - Stroke: 0.400 in (10.16 mm) - Power: 0.05 BHP @ 12,000 RPM (0.037 KW) - Induction: Front rotary valve - Piston / Liner: Steel piston / Cast Iron liner - Ignition: Glow plug (short reach) - Rotation: Clockwise - Propeller: 7/8" diameter 7/8" pitch (22.23 x 22.23 mm).