This manual provides instructions for the O.S. FS-56, the first model in the new FS series of single-cylinder overhead valve four-cycle engines. It features a modern design, a broad power band, and a newly designed F-4040 silencer that minimizes noise. The engine shares mounting dimensions and linkage positions with the FS-52S but does not include tools or accessories in the box.
| Engine Type | Single cylinder overhead valve four cycle |
|---|---|
| Fuel Type | Methanol based fuel |
| Lubricant Requirement | Not less than 18% castor oil |
| Nitromethane Content | 5-20% |
| Propeller Size (Sport & Aerobatic) | 13x6, 12x6-8 |
| Propeller Size (Scale) | 13x6-7, 12x6-8 |
| Carburetor Type | Type 40NA |
| Glow Plug Type | TYPE F |
The engine should be operated on a methanol based fuel containing not less than 18% castor oil or a top quality synthetic lubricant.
No, the engine is not supplied with any tools such as Allen keys or wrenches.
For Sport & Aerobatic use, 13x6 or 12x6-8; for Scale use, 13x6-7 or 12x6-8.