Service manual

4-14
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A
Diaphragm check
1. Check the diaphragm. Replace if dam-
aged.
Arm check
1. Check the arm 1. Repair if bent.
Replace if damaged.
2. Measure the arm height a.
TIP:
• Measure the distance between the surface
of the carburetor body b and the top sur-
face of the arm.
• The arm should be resting on the needle
valve, but not compressing it.
Body assy. check
1. Clean the body assy., and then check the
body assy. Replace if damaged.
2. Check the valve (clear film) 1. Replace if
damaged.
TIP:
Always replace the body assy. and valve
(clear film) as a set.
Needle valve check
1. Clean the needle valve assy., and then
check the needle valve assy. Replace if
worn a.
TIP:
Always replace the needle valve and needle
valve seat as a set.
Jet and carburetor body check
Do not use a steel wire to clean the jets.
This may enlarge the jet diameters and
seriously affect performance.
1. Clean the main jet, pilot jet and carbure-
tor body, and then check the main jet,
pilot jet and carburetor body. Replace if
damaged or worn.
Arm height a: 0–0.2 mm (0–0.008 in)
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b
Carburetor and fuel pump