Briggs & Stratton Twin Cylinder L-Head, Repair Manual

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DISASSEMBLE CARBURETOR – ALL STYLES
The disassembly procedure for all style carburetors is similar enough that it can be considered the same. Refer to
figures 1 and 2 for reference and the names of components.
Separate upper and lower carburetor body. Remove float and inlet needle. Remove idle jet, pilot jet or idle mixture
valve, if equipped. Remove fixed jet plug, anti-afterfire solenoid or high speed mixture, valve if equipped. Disassemble
fuel pump. Discard “O”-rings, seals, gaskets and diaphragms. Mark choke and throttle plate before removing so that
they may be installed in their original position. Remove choke and throttle plates. Remove throttle and choke shafts.
INSPECT CARBURETOR – ALL STYLES
Check all moving parts for wear, nicks and burrs. Check float for leaks or damage. Check mixture valves for damage or
burrs. Check all mating surfaces for nicks, burrs, foreign material, or cracks. Replace all worn or damaged parts.
CARBURETOR CLEANING RECOMMENDATION
WARNING: WEAR SUITABLE skin protection when using cleaners. FOLLOW instructions on container.
1. Disassemble carburetor.
2. Remove and discard all old gaskets, seals and sealing material.
3. Use commercial carburetor cleaning solvents (such as Briggs & Stratton Spray Cleaner, Part #100041 or 100042)
to clean carburetor parts and body.
4. When cleaning non-metallic parts (plastic, nylon, Minlon

, etc.), do not leave in commercial carburetor cleaner more
than 15 minutes.
NOTE: Parts containing rubber, such as seals, “O”-rings, inlet needles, seats or pump diaphragms should never
be placed in commercial carburetor cleaner.
WARNING: TO PREVENT eye injury, always wear eye protection when using compressed air.
5. Use only compressed air (blowing in both directions) to clean out all openings and passages.
NOTE: Do not use wires, drills or any other devices to clean out metering holes or passages.
CHECK THROTTLE, CHOKE SHAFT AND
BODY FOR WEAR
1. Lay carburetor on flat surface and check throttle
and choke shaft clearance as shown in Fig. 14.
Throttle shaft and choke shaft clearance must not
exceed .010” (.25 mm).
2.
Inspect throttle shaft and choke shaft for wear,
Fig. 15.
Replace if worn.
If throttle shaft bushing is worn it should be replaced.
If choke shaft bearing is worn, the carburetor upper
body must be replaced.
Fig. 14 – Check Throttle Shaft Wear
1/8” (3 mm)
PLATE
.010”
(.25 mm)
Fig. 15 – Check Throttle Shaft
WORN