well vent and a leaner mixture with a larger well vent. If the mixture suddenly becomes too rich at high
speeds, examine the well vent and make sure that it is not obstructed. Inspect these jets for water and dirt.
STARTING
Open the throttle about one-quarter. Pull the choke control out all the way. Step on the starter. As soon as
the engine starts, push the choke control in about one-third of the way and as the engine warms up, continue
to push it in gradually until the choke valve is wide open.
FUEL LEVEL
Correct setting of the float which controls the fuel level is of utmost importance. The fuel level is set at the
factory for regular motor gasoline and a pump pressure of 2-lbs.per square inch.
ZENITH 68 SERIES CARBURETOR
OPERATION AND SERVICE
The Zenith 68 series carburetors are of updraft single venturi design. They are made in 7/8" and 1" S.A.E.
barrel sizes; with 7/8" and 1" S.A.E. flange sizes. They are made with selective fuel inlet, and with or
without a main jet adjustment.
These carburetors are "balanced" and "sealed", and the semi-concentric fuel bowl allows operation to quite
extreme angles without flooding or starving. This design makes them particularly adaptable to smaller form
tractors and a great variety of agricultural machines and industrial units.
FUEL SUPPLY SYSTEM
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