ROCHESTER 4 BARREL CARBURETOR - 5C-990-823225--1 1096
Preliminary Idle Speed and Mixture
Initial start setting; make final adjustments with en-
gine running.
1. Turn idle stop screw out until it does not contact
throttle lever, then turn in until it just contacts
throttle lever.
72081
a - Idle Stop Screw
b - Throttle Lever
b
a
2. Turn idle needles until LIGHTLY seated then
back out 2 to 3 turns.
72098
a - Idle Needles
a
IMPORTANT: Do not turn idle mixture screws
tightly against seat, as damage to seat and/or
needle may result.
Final Idle Speed and Mixture
IMPORTANT: Boat MUST BE in the water and en-
gine at normal operating temperature to accu-
rately check and adjust idle speed and mixture.
Carburetor should be set so that engine idles
smoothly, with boat in the water, engine at normal op-
erating temperature and drive unit in forward gear. To
adjust idle speed and mixture, proceed as follows:
IMPORTANT: DO NOT attempt to compensate for
other engine problems (incorrect ignition timing,
faulty ignition components, low compression,
vacuum leaks, etc.) with carburetor adjustments.
This will only cover the problem which must be
corrected if engine is to achieve maximum fuel
economy and performance.
1. Connect a shop tachometer to engine.
IMPORTANT: DO NOT turn idle mixture needles
tightly into seat, as damage to needle and/or seat
may result.
2. If a new or rebuilt carburetor has been installed,
turn each idle mixture needle until it LIGHTLY
contacts seat, then back out 2 or 3 turns. This will
provide a sufficient setting to allow starting the
engine.
3. Start engine and run at 1500 RPM until engine
reaches normal operating temperature.
To Next Page
Loading...
Need help?
General