Carburetor Adjustment - Briggs & Stratton 351700, 380700, 381700 Operating & Maintenance Instructions

TO ADJUST REMOTE THROTTLE CONTROL
If the engine does not start or if it runs roughly, the remote
throttle control may need adjustment. See your authorized
Briggs & Stratton dealer or follow the instructions below.
CASING CLAMP SCREW
SWIVEL
EXHAUST MANIFOLD
THROTTLE STOP
[1] Remove air cleaner. Move throttle control to FAST.
(Swivel should be against throttle stop.)
[2] If not, loosen casing clamp screw. Move casing
and wire in direction shown by arrow until swivel is
against throttle stop.
[3] Tighten casing clamp screw. Replace air cleaner.

CARBURETOR ADJUSTMENT

WARNING
The manufacturer of the equipment on which this
engine is installed specifies top speed at which the
engine will be operated. DO NOT EXCEED this speed.
Differences in fuel, temperature, altitude or load may require
minor carburetor adjustment. Air cleaner and its 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. DO NOT remove limiter caps. DO NOT
force beyond limits.
TO ADJUST CARBURETOR
IDLE SPEED SCREW
CYL # 1
IDLE MIXTURE
VALVES
CYL # 2
[1] Start engine and warm up approximately 5 minutes
before adjusting.
[2] With engine running, place throttle control in SLOW.
[3] Rotate carburetor throttle lever against the idle
speed screw and hold it.
[4] Turn idle speed screw to obtain 1200 rpm.
[5] While still holding carburetor throttle lever against
idle speed screw, set cylinder #1 idle mixture valve
midway between limits.
[6] Then set cylinder #2 idle mixture valve midway
between limits.
[1] Readjust the idle speed to 1200 rpm, if governed idle
[2] Release carburetor throttle lever. Move throttle
Engines operated at about 3000 to 5000 feet (900 to 1500
meters) above sea level may require a high altitude carbu-
retor main jet. If erratic performance is observed, contact a
Briggs & Stratton Authorized Service Dealer for cost to
install/purchase a high altitude carburetor main jet.
CARBURETOR
THROTTLE LEVER
LIMITER CAP
15
ADJUSTMENTS
GOVERNED IDLE SPRING
(RED OR WHITE)
Governed idle spring
spring is red, or 900 rpm, if governed idle spring is white.
control to FAST position. Engine should accelerate
smoothly. If it does not, readjust idle mixture valves
slightly counterclockwise.
EXHAUST
MANIFOLD