Service Manual

5. Use light pressure with a finger to fully close choke
valve. Measure clearance between choke valve and
choke bore when throttle valve is fully opened.
Choke valve to choke bore clearance 1.45 mm (0.57 mm)
Figure 153
If clearance is out of specification, adjust by moving
choke shaft end.
Choke shaft end
Choke shaft end Valve clearance Remarks
Lower Larger Engine becomes more
difficult to start and
tends to stall
Raise Smaller Carbon tends to
accumulate on spark
plugs
Figure 154
6. Use a hand vacuum pump to check that there are no
clogs i
n port lines. If a port line is clogged, disassemble,
clean and reassemble.
Figure 155
Liquid Cooled Gas Engine
Page 3
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Workman 3000/4000 Series