Reed Valve; Inspection - Yamaha YTZ250S 1986 Service Manual

1. Float height
1. Tang
REED VALVE
Inspection
1. Inspect rubber intake manifold for signs
of weathering, checking or other deteri-
oration.
2. Inspect reed valves for signs of fatigue
and cracks. Reed valves should fit flush or
nearly flush against neoprene seats. If in
doubt as to sealing ability, apply suction
to carburetor side of assembly. Leakage
~ould
be slight to moderate.
3. Check valve stopper height. If beyond
tolerance, adjust or replace.
3-9
Valve stopper height:
9.4±0.2 mm (0.370±0.008 in)
1.
Valve stopper height
If it is 0.3 mm (0.012 in) more or less than
specified, replace the valve stopper.
4. Check reed valve for bending. If beyond
tolerance, replace reed valve.
Reed valve bending limit:
0.6 mm (0.022 in)
5. During reassembly, note the cut in the
lower corner of the reed and stopper
plate.