The O.S. Type 20A and 20B automatic carburettors are specifically designed for O.S. racing car engines. They unlock the full potential of these engines, providing instant throttle response, rapid acceleration, and high peak power output.
This manual provides installation and operating instructions for the OS Type 20A and 20B automatic carburettors. These slide-throttle units are specifically designed for O.S. racing car engines to provide instant throttle response, rapid acceleration, and high peak power output. The carburettor features an insulating sleeve of engineering plastic on the shank to minimize heat transmission from the crankcase.
| Application | O.S. racing car engines |
|---|---|
| Throttle Type | Slide-throttle |
Loosen the retainer screw, align vertically with a sealing washer and heatproof rubber gasket, then press firmly down and tighten further by 120~180°.
Set it to produce maximum power at full throttle, which establishes the basic fuel/air mixture strength maintained by the automatic system.