Initial Carburetor Adjustment; Final Carburetor Adjustment - Briggs & Stratton Vanguard 430000 User Manual

Initial Carburetor Adjustment

1. Turn idle mixture screw clockwise until it just
seats. DO NOT FORCE. Turn screw counter-
clockwise 1/2 turn (Figure 56). This setting
will permit engine to start.
NOTE: Final adjustment will be made with engine
running.
10
Figure 56

Final Carburetor Adjustment

NOTICE: All carburetor adjustments must be made
with the air cleaner installed.
1. Start and run engine at low speed for
approximately five minutes. Or, if equipped
with a temperature gauge, until needle
moves from C or COLD position.
2. With control lever on equipment in SLOW
position, hold throttle lever (A, Figure 57)
against idle speed screw and adjust idle
speed to 1200 RPM.
Figure 57
80
3. SLOWLY turn idle mixture screw clockwise
until engine speed just starts to slow (lean
mixture).
4. Then SLOWLY turn idle mixture screw
counter-clockwise until engine speed just
starts to slow (rich mixture).
5. Turn idle mixture screw to mid point between
rich and lean (Figure 58).
Figure 58
6. Hold throttle lever against idle speed screw
and readjust idle speed to 1500 RPM, or
equipment manufacturer's specification.
NOTE: If carburetor is equipped with an idle mixture
limiter cap, install at this time.
7. Position limiter cap so that stop(s) on the
limiter cap are at mid point between stop(s)
on carburetor body and press into position.