Repair manual

Carburetor Inspection and Adjustment WM 80 Repair
96 wc_tx000522gb.fm
8 Carburetor Inspection and Adjustment
8.1 Inspection
Diaphragms:
• Check for tears, punctures, and distortion in the elastic material.
Replace the diaphragm if it appears stretched or puckered.
• Be certain diaphragms are installed correctly. See appropriate
exploded view. On Walbro and Tillotson carburetors, be sure that
the control diaphragm is connected to the inlet lever.
• Evenly tighten all screws securing the diaphragm covers to
ensure good seal and avoid leaks.
• Complete repair kits are available: P/N 0171010—Walbro carbu-
retors; P/N 2005690—Tillotson carburetors; P/N 0065689—Bing
carburetors.
Inlet Needle Valve:
• The inlet needle must seal properly or the engine may flood or
run rich. The elastic tip must be in good condition. Replace the
needle if the tip becomes hard or brittle.
• Keep the seating area clean and free from dirt. Clean it using
compressed air.
Control Lever Spring:
• Be certain that the spring is seated correctly under the inlet lever
and that it has enough tension to seat the inlet needle. Replace
the spring if worn or broken. Do not stretch the spring.
Adjustable Mixture Needle Valves (Tillotson):
• On Tillotson carburetors with adjustable mixture needle valves,
the valves must have absolutely smooth points. Replace the nee-
dle valves if the taper appears worn or damaged.
NOTICE: Do not turn in the adjusting screws too tight or the valve
seats may be damaged.
Fixed Jets:
• Clean the jet orifice using compressed air. Use a narrow screw-
driver when installing jets to avoid shaving metal from inside of
the carburetor body which could plug the jet orifice.