After the break-in period a good cruising speed for sail boat installations is about 2000 RPM or about 80%
of the maximum engine speed obtainable.
ZENITH MARINE CARBURETORS
61 Series - 1967 and before
1 Venturi
2 Main Jet
3 Main Dis. Jet
4 Well Vent
5 Idling Jet
6 Idling Needle Valve
7 Throttle Plate
8 Idle Discharge Plug
9 Throttle Shaft
10 Restriction Bushing
11 & 11A - Pick up tube
12 Throttle stop screw (Not Illustrated)
13 Pick-up Tube metering orifice
14 Main jet adjustment
15 Idle fuel channel
16 Idle air channel
If the adjustments have been altered, start with a standard setting, which is:
1, Throttle stop screw - 1-1/2 turns (to right) from fully closed position of throttle plate (7).
2. Idling needle valve (6) one turn open (to left) from seat.
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