Carburetor Inspection and Adjustment WM 80 Repair
98 wc_tx000522gb.fm
8.3 Carburetor Adjustments
Walbro:
Procedures apply in only non-EPA regulated applications.
Both high- and low-speed mixture adjustment is possible. A special
tool is required. See section Operating & Idle Speeds for correct
operating and idle speed settings. For best accuracy use a tachometer
when making carburetor adjustments.
For initial carburetor set-up after rebuilding, complete the following
procedures:
8.3.1 Turn in (clockwise) high- (H) and low-speed mixture needle valve (L)
by hand until tight.
NOTICE: Do not overtighten the valves. Damage to the valve seats
may result.
Preset the fuel jets as follows:
8.3.2 Open the low-speed needle valve 1-1/2 revolutions counterclockwise.
8.3.3 Open the high-speed needle valve 3-1/2 revolutions counterclockwise.
8.3.4 Start the engine and allow it to run at high speed for 3–6 minutes.
Check the adjustments by running the machine at full throttle and at
idle several times. Keep the choke fully open. If further adjustments are
necessary, continue with step 5.
Note: After full throttle operation, allow engine to idle one minute
before making any adjustments.
8.3.5 When making carburetor adjustments, turn the valve screws in small
increments, no more than 1/16 of a revolution (turn) at a time. Turn the
screws clockwise to lean, counterclockwise to enrich. Allow 5 seconds
after each adjustment for engine to stabilize.
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