Current Style - Type Nos. 1100 And Above; Previous Style - Type Nos. 1100 And Above Engines Built Before 98101500; Early Style - Type Nos. Under 1100 - Briggs & Stratton Twin Cylinder L-Head Repair Manual

Current Style – Type Nos. 1100 And Above
Engines Built After 98101500
The current style carburetor has no external adjust-
ments other than idle speed. Components are NOT
interchangeable with previous carburetors. The air
cleaner base has two holes to accommodate the dual
bowl vents and the throttle link is 1/16" (1.6 mm) longer.
IMPORTANT:
Horizontal Crankshaft Engines: The current style
carburetor may be used to replace earlier style
carburetors ONLY if the air cleaner base and throttle
link are also replaced.
Vertical Crankshaft Engines: The current style
carburetor may be used to replace earlier style
carburetors ONLY if the throttle link is also replaced.
Previous Style – Type Nos. 1100 And Above
Engines Built Before 98101500
The previous style carburetor may be identified by a
welch plug located above the idle mixture valve or pilot
jet. Carburetors equipped with a pilot jet have no
external adjustments other than idle speed.
The carburetor is equipped with fixed main jet or
optional adjustable high speed mixture valve.
Fixed main jet carburetors may also be equipped with
an optional anti-afterfire solenoid.
Early Style – Type Nos. Under 1100
Early style carburetors have no welch plug above the
idle mixture valve.
The carburetor is equipped with an adjustable high
speed mixture valve or an optional fixed main jet screw.
4
3
4 SCREW PUMP
COVER
NO EXTERNAL
MIXTURE
ADJUSTMENT
BRASS PULSE TUBE NIPPLE
Fig. 3 – Current Style – Type Nos. 1100 And Above
WELCH
PLUG
MIXTURE
VALVE OR
PILOT JET
Fig. 4 – Type Nos. 1100 And Above
3 SCREW PUMP COVER
IDLE
MIXTURE
VALVE
Fig. 5 – Early Style Type Nos. Under 1100
DUAL BOWL VENTS
PLASTIC CHOKE SHAFT
After 98101500
3 SCREW PUMP COVER
METAL CHOKE
SHAFT
OPTIONAL ANTI-AFTERFIRE
SOLENOID
IDLE
PLASTIC
PULSE
TUBE
NIPPLE
Before 98101500
METAL
CHOKE
SHAFT
HIGH SPEED
PLASTIC
PULSE
TUBE
NIPPLE
FIXED MAIN JET SCREW
(OPTIONAL)
CAST-IN
LOGO
MIXTURE
VALVE