Service Manual

Choke Breaker Opening
1. Inspect after doing Full–Auto–Choke inspection.
2. Run engine at idle. Move choke valve in closing direc-
tion with light finger force until valve resists being
moved. Measure clearance between choke valve and
choke bore at this point.
Choke valve to choke bore clearance 1.8 mm (0.071 mm)
(Carburetor ID Mark TMB)
Choke valve to choke bore clearance 2.3 mm (0.091 mm)
(Carburetor ID Mark TEB)
Choke valve
Clearance
Figure 37
3. If clearance is out of specification, adjust by opening
or closing part shown in illustration.
Rod end Valve clearance Remarks
Opened Larger Engine becomes more
difficult to start and
tends to stall
Closed Smaller Carbon tends to
accumulate on spark
plugs
To open
To close
Figure 38
Liquid Cooled Gas Engine
Page 3
– 26 Rev. B
Workman 3000/4000 Series