This is an instruction manual for O.S. engines, which provides detailed information on the engine's construction, operation, maintenance and repair.
This manual provides instructions for the O.S. 21XZ-M engine, which is designed expressly for 21 class boat racing based on the race-proven MAX-21XZ-R road car racing engine. It includes safety warnings, engine construction details, and notes on applying an electric starter.
| Application | 21 class boat racing |
|---|---|
| Base Design | MAX-21XZ-R |
| Carburetor | 10mm 21D |
| Standard Glow Plug | RP7 |
| Standard Head Gasket | 0.2mm |
A fuel containing 20% nitromethane is recommended as a starting point.
The suggested propeller diameter is 41-43mm.