THE FUEL SYSTEM AND GOVERNOR
30
Disassembly and rebuilding the carburetor
1. Clamp-off the fuel line to prevent fuel spillage,
then disconnect the fuel line from the carburetor.
2. Disconnect the primer hose.
3. Remove the carburetor by following the steps
described in Chapter 3: Air Intake and Filter.
NOTE: An insulator separates the carburetor
from the cylinder head.
• A bowl vent port is in a recessed passage
on the end of the carburetor that faces the
insulator.
• A second passage in the insulator supple-
ments the passage on the carburetor.
• Gaskets separate the insulator from the
cylinder head and the carburetor from the
insulator.
• A port in the carburetor to insulator gasket
ties the bowl vent passages together.
4. Check the vent passages.
5. Check the gaskets and the insulator block.
6. Remove the bowl bolt using a 10mm wrench.
See Figure 4.12.
NOTE: From this point an assessment can be
made about the viability of rebuilding the carbu
-
retor.
• If extensive corrosion is evident, replace the car-
buretor.
• If varnish build-up is too extensive to clean,
replace the carburetor.
7. When inverted, the float should rest in a level
position.
See Figure 4.13.
Figure 4.11
Bowl vent port
Bowl vent
channel
insulator block
gasket
Figure 4.12
Float bowl
Drain bolt
Flat fiber
gasket
Bowl bolt
with recess in
head for O-ring
Gasket seal
Figure 4.13
Float
Float pin
Float valve
Fuel inlet
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