Briggs & Stratton 290000 Operating & Maintenance Instructions page 15

WARNING
GASOLINE OPERATED ENGINES
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. Air cleaner and air cleaner cover must
be assembled to carburetor before starting engine.
TO ADJUST CARBURETOR
[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 1400 rpm (1200 rpm
on two barrel carburetor).
[5] While still holding carburetor throttle lever against idle
speed screw, turn idle mixture valve with limiter cap
screw midway between limits. DO NOT remove limiter
caps. DO NOT force beyond limit.
[6] On two barrel carburetor: set cylinder #1 idle mixture
valve midway between limits. Then set cylinder #2 idle
mixture valve midway between limits, while holding
carburetor throttle lever against idle speed screw.
ON NG/LPG OPERATED ENGINES
ADJUSTING FUEL MIXER
If adjustment is needed, see a Briggs & Stratton Authorized Service Dealer who has been licensed by the state or local
municipality (if required) in which the service is performed. Mixer adjustment requires special equipment and a qualified
technician. DO NOT remove limiter caps. DO NOT force beyond limits.
CARBURETOR / FUEL MIXER ADJUSTMENT
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.
Single barrel carburetor
CARBURETOR
THROTTLE
LEVER
Two barrel carburetor
CARBURETOR
THROTTLE
LEVER
IDLE SPEED
SCREW
Note:
Engines operated at about 3000 or higher (900 meters or higher)
above sea level may require a high altitude carburetor main jet. If
erratic performance is observed, contact a Briggs & Stratton
Authorized Service Dealer for installation of a high altitude
carburetor main jet.
15
ADJUSTMENTS
IDLE SPEED
SCREW
IDLE
MIXTURE
VALVE
IDLE MIXTURE
VALVES
CYL # 1
CYL # 2
LIMITER
CAP