ADJUSTMENTS
THROTTLE ADJUSTMENT
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.
WARNING
Prevent unintentional starting.
Before performing adjustments:
•Remove spark plug wire from spark plug.
•Disconnect battery at negative terminal (only engines with electric start).
TO ADJUST MANUAL FRICTION THROTTLE
THROTTLE
CONTROL
WING
NUT
CONTROL
PLATE
•Loosen or tighten wing nut on control plate until throttle control moves with some resistance and still remains in desired position when engine is running.
TO ADJUST REMOTE THROTTLE
CASING
CLAMP
SCREW
WIRE
CASING
[1]Loosen casing clamp screw on control plate.
[2]Move wire and casing in direction of arrow to end of travel.
[3]Move remote throttle control to FAST.
[4]Tighten casing clamp screw.
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.
Air cleaner and air cleaner cover must be assembled to carburetor before starting engine. (Air cleaner is shown removed in illustration below for clarity ONLY.)
The carburetor on this engine is equipped with an idle mixture valve with a limiter (see inset), which allows some adjustment. Idle speed is not adjustable.
TO ADJUST CARBURETOR
IDLE MIXTURE
SCREW
WITH LIMITER
FIXED IDLE
SPEED SCREW
[1]To adjust idle speed, start engine and warm up about 5 minutes.
[2]With engine running, place equipment throttle control in SLOW position.
[3]Rotate carburetor throttle lever against the idle speed screw and hold it. Turn idle speed screw to obtain 1750 rpm (use a tachometer).
[4]Then rotate idle mixture valve full travel clockwise and then counterclockwise.
Note: DO NOT remove limiter caps. DO NOT force beyond limits.
[5]Then, position idle mixture valve in middle of travel.
[6]Check idle speed.
[7]Move throttle control to FAST position. Engine should accelerate smoothly. If it does not, adjust idle mixture valve counterclockwise 1/8 turn.
Note: Engines operated at approximately 3000 to 5000 feet (900 to 1500 meters) above sea level may require a high altitude carburetor nozzle. If erratic performance is ob- served, contact a Briggs & Stratton Authorized Service Dealer for cost to install/purchase a high altitude carburetor nozzle.
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