MTD Engine - Series 350/450/650
26
8.22. There is a corresponding passage recessed into
the mating surface where the throttle end of the
carburetor housing meets the gasket.
See Figure 8.22.
8.23. Bowl removal is a logical place to begin carbure-
tor disassembly. Remove the bowl bolt using a
10mm wrench. See Figure 8.23.
8.24. From this point an assessment can be made
about the viability of rebuilding the carburetor.
• If extensive corrosion is evident, replace the car-
buretor.
• If varnish build-up is too extensive to clean,
replace the carburetor.
8.25. When inverted, the float should rest in a level
position. See Figure 8.25.
8.26. Remove the pin that the float hinges on to
remove the float.
8.27. The float is not adjustable. Spring tension
against the float valve begins to build from the
horizontal position, putting progressively more
pressure between the tip of the valve and the
seat. See Figure 8.27.
8.28. Because the float valve is crucial to the function-
ing of the carburetor, and the viton tip of the
valve is subject to wear, it is suggested that tech-
nicians replace the valve and spring any time the
carburetor is disassembled for cleaning.
Figure 8.22
Bowl vent port
Bowl vent
channel
Figure 8.23
Float bowl
Drain bolt
Flat fiber
gasket
Bowl bolt
with recess in
head for O-ring
Gasket seal
Figure 8.25
Float
Float pin
Float valve
Fuel inlet
Figure 8.27
Float
Compression
spring
Float valve
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