O.S. FS56a 4 Stroke

A big performance boost for 40-size planes!

Ushering in a new era in O.S. 4-stroke technology: the 56FS-a. It's the first in the alpha series, with the latest advancements for boosting your plane's performance.

• Mounts with no-mod ease in the same space as the 52FS.
• In addition to less noise, the muffler features a multi-positional manifold with a rubber O-ring that helps prevent oil leakage.
• A newly designed lubrication system eliminates the need for crankcase ventilation.
• The 40NA carburetor is equipped with a venturi that reduces the chance of fuel leaking out onto the cowl, while also creating more positive air/fuel flow.

It's like giving your 40-size plane a new lease on life!

OS FS56a Specifications

• Displacement: 0.569 cu in (9.32 cc)
• Bore: 0.945 in (24.0 mm)
• Stroke: 0.811 in (20.6 mm)
• Practical rpm range: 2,400-13,000
• Output: 1.0 hp @ 10,000 rpm
• Weight w/muffler: 16.26 oz (461 g)
• Includes: 40NA carburetor, muffler
• Recommended props: Sport & aerobatic; 13x6, 12x6-8; Scale: 13x6-7, 12x6-8

			[OS34300] O.S FS56a - 4 stroke engine - Performance boost for your 40 class plane. Download OS FS56a Manual Download OS FS56a Parts Expl.

OS Four Stroke Series

			[OS33000] OS FS30S four stroke motor w/muffler Download OS FS 30S Manual Download OS FS 30S Parts

			[OS34300] O.S FS56a - 4 stroke engine - Performance boost for your 40 class plane. Download OS FS56a Manual Download OS FS56a Parts Expl.

			[OS34810] O.S FS81a - 4 stroke engine ideal power for 60 class planes. Download OS FS 81a Parts Expl.

	Download OS 120SE Manual		[OS35530] O.S FS120S-E - 4 stroke engine - Tremendous 4-stroke power for high-demand applications

			[OS35960] O.S FS120S - 4 stroke engine Download OS FS-120S III Manual Download OS FS-120S III Parts Exp

			[OS35940] OS FS-200S Four Stroke motor Download OS FS 200s Parts Exp

			[OS5960] O.S FS 200S-P - 4 stroke engine ideal power for sport or scale planes. Download OS FS 200S-P Parts Expl.