This document introduces the usage of O.S. 2F, 2FB automatic carburetor, and describes its features and how to use it.
This manual provides instructions for the O.S. Type 2F & 2FB automatic carburettor, which features an automatic mixture control device to ensure a balanced fuel-air mixture at all throttle settings. The document explains how to adjust the needle-valve, mixture control screw, and throttle stop screw for optimal engine performance under various conditions.
| Idle Speed Range | 2,500 to 3,000 r.p.m. |
|---|---|
| Break-in Time | about 1 hour of total running time |
Gradually close the Needle-Valve until the engine runs at its maximum speed, setting it very slightly to the "rich" side of the peak r.p.m. setting.
Open the throttle; if it hesitates before picking up speed, the mixture is too rich and may require closing the Mixture Control Screw.
Turn the Throttle Stop Screw counter-clockwise if the engine runs too fast with the throttle closed.