MTD Engine - Series 350/450/650
22
8.5. The tank should not hold any pressure nor any
vacuum.
• Replace the cap if either pressure or vacuum
builds using the hand-pump tester.
• A cap that maintains pressure will cause the
engine to run rich as the fuel in the tank heats
and expands, forcing it’s way past the float valve
in the carburetor.
• A cap that maintains vacuum will cause the
engine to run lean as the fuel is depleted, but no
air comes in to replace it.
• The two conditions may both be present, but the
symptoms vary with fuel, fuel level, and operat-
ing conditions.
• Usually presents as a “Runs and quits” scenario.
8.6. All models are equipped with a manual choke,
operated by a pull-knob on the handlebar.
See Figure 8.6.
8.7. If the choke plate fails to close fully when the
knob is pulled, the mower will be difficult or
impossible to start when cold.
8.8. The rod connecting the choke lever to the choke
arm on the carburetor can be bent slightly to
facilitate adjustment. See Figure 8.8.
NOTE: Stale, contaminated, or out-dated fuel is
a leading cause of no-start situations. If the fuel
in the tank, lines, or carburetor is suspect, it may
be easily drained.
8.9. Make provisions to safely catch and dispose of
drained fuel before draining it.
Figure 8.6
Choke cable
Choke lever
Figure 8.8
Choke rod
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For Discount White Outdoor Parts Call 606-678-9623 or 606-561-4983
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