Engine Model:
Briggs & Stratton
Classic,
450 and 500 Series
Page
18 of 32 B&S Classic, 450 and 500 Series Selfhelp
Guide 2011, Issue 1.0
REMOVE THE CARBURETTOR AND FUEL TANK
1. Remove the carburettor and fuel tank assembly mounting bolts.
2. Slip the carburettor and fuel tank assembly off the end of the fuel intake tube.
3. Turn the fuel tank assembly to free the throttle link from throttle lever.
This stage provides a good opportunity to empty any sediment from the tank and
to rinse it with petrol.
SEPARATE THE CARBURETTOR AND FUEL TANK
1. Remove the 5 screws securing the
carburettor to the tank.
2. Remove the carburettor from the
tank.
3. Remove the diaphragm and gasket
from the tank.
REPLACE THE DIAPHRAGM AND GASKET
1. Place the new diaphragm on the tank top, then place the new gasket on top of
the diaphragm. NOTE: It is worthwhile cleaning around the top of the tank with a
clean cloth with some petrol on it to remove any grease or dirt so that an airtight
seal is achieved with the diaphragm.
2. Lower the carburettor assembly down onto the gasket and diaphragm.
3. Replace the 5 screws and tighten them evenly.
RE-ASSEMBLY
Reassemble the tank assembly in the reverse manner to the disassembly described
above.
