Some units use a well jet in addition to the step-up rod jet. The well jet is located in the bottom of the bowl next to the step-up jet. Other models use an additional fuel feed called the “constant feed.” This is a metered bushing pressed into the casting and…
Fuel for most part throttle and full throttle operation is supplied through the high-speed circuit. As intake manifold vacuum is a direct indication of engine load, a vacuum controlled diaphragm step-up rod provides instantaneous response to engine demands. During part throttle operation, the relatively high vacuum from the intake manifold…
Fuel for idle and the early part of throttle operation is metered through the low-speed circuit. The low-speed jet is pressed into place within a passage in the casting to prevent possible damage. It cannot be removed but it can be cleaned by blowing compressed air through the step-up rod…
The float assembly in the RBS is compact for extreme rigidity assuring little or no change in float setting due to vibration or heat. The cellular nitrophyl float is impervious to denting under normal handling and is not susceptible to punctures, assuring a constant buoyance factor. Nitrophyl floats will, however,…
The RBS (round bowl single) carburetor is made up of a single aluminum casting with pressed steel fuel bowl. Fuel pick-ups are located near the center line of the carburetor bore to gain the benefits of a concentric bowl carburetor, yet so located that engine heat being radiated through the…
If Idle trouble is experienced, first check the manifold to cylinder head gasket and the carburetor to manifold gasket for air leaks. At slow idle an engine requires only approximately 20 to 25lbs of air per hour, and a slight leak will result in a very erratic or rough idling…
There are three types of TSX series carburetors The Marvel-Schebler Model TSX carburetor is manufactured in three SAE nominal sizes: 7/8″, 1″, 1 1/4″. In addition to these variations in size, there are also variations necessitated by the specific requirements of the engines on which the carbs are used. Many…
Preliminary adjustments Set speed control lever so that throttle valve is open slightly. Make certain that fuel supply to carburetor is open. Close choke valve. Start engine and partially release choke. After engine has been run sufficiently to bring up to operating temperature throughout, see that choke is returned to…