Reed Valve; Inspection; Water Release Valve - Yamaha YT175J 1982 Service Manual

REED VALVE
Inspection
1. Inspect rubber intake manifold for signs
of weathering, checking or other
deterioration.
2. Inspect reed petals for signs of fatigue
and cracks. Reed petals should fit flush
or nearly flush against neoprene seats. If
in doubt as to sealing ability, apply suc-
tion to carburetor side of assembly.
Leakage should be slight to moderate.
3. The valve stopper controls the move-
ment of the valve. Check clearance "a".
Standard value "a":
9
mm
(0.35
in)
If it is
0.5
mm
(0.020
in) more
or
less
than specified, replace the valve stop-
per.
4. Check reed valve for bending. If beyond
tolerance, replace reed valve.
Reed valve bending limit:
0.2
mm
(0.008
in)
5. During reassembly, note the cut in the
lower corner of the reed and stopper
plate. Use as aid to direction of reed in-
stallation.
4-4
Water release valve
Check the valve for good sealing or move-
ment.
1 . If the valve does not provide good seal-
ing nor move smoothly, it should be
replaced with a new one.
A defective valve may allow water to
leak in while riding in the rain or crossing
water paddles.
,. Air filter case 2. Float valve 3. Oil seal