15
ADJUSTMENTS
CARBURETOR ADJUSTMENTS
Differences in fuel, temperature, altitude or load may require
minor carburetor adjustment. Air cleaner and air cleaner cover
must be assembled to carburetor before starting engine.
The carburetor on this engine is low emission. It is equipped
with an idle mixture valve with a limiter (see inset), which allows
some adjustment, and an idle speed adjustment screw.
Before adjustment, start and warm up engine approxi-
mately 5 minutes.
[1]. Place throttle control in IDLE or SLOW position.
[2]. Rotate carburetor throttle lever against idle speed screw
and hold.
[3]. Adjust idle speed screw to obtain equipment manufac-
turer’s specified idling speed.
[4]. Turn idle mixture valve with limiter midway between
limits.
FUEL
DRAIN
PLUG
CARBURETOR
THROTTLE
LEVER
IDLE
MIXTURE
VALVE
WITH LIMITER
IDLE SPEED
SCREW
Note
: Engines operated at approx. 900 to 1500 m. (3000 to
5000 ft.) or above sea level may require a high altitude carbure-
tor main jet. If erratic performance is observed, contact an Au-
thorized Briggs & Stratton 3/LC Service Dealer for a high alti-
tude carburetor main jet.
Summary of Contents for 430447
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