Removal And Assembly - Yamaha LB50IIAC Service Manual

3. Handling the reed valve
a. As explained earlier, the reed valve is
operated by changes in crankcase
pressure and by the inertia effect of the
fuel-air stream. It is a high-precision
piece. and therefore, it must be handled
with special care.
4. Storage
a. The reed valve must be stored in a clean
and dry place and must not be exposed
to the sun. Particularly, it must be kept
free from salt. Avoid touching the valve.
Removal and assembly
With carburetor removed, proceed as
follows:
1. Remove the bolts (4) holding the intake
manifold and reed valve assembly to
cylinder.
Remove assembly.
2. Inspect reed petals for signs of fatigue
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. If disassembly of the reed valve
assembly is required, proceed as
follows:
a. Remove Phillips screws (2) securing
stopper plate and reed to reed block.
Handle reed carefully. Avoid scratches
and do not bend.
Note from which side of the reed block
the reed and stopper plate were remov-
ed. Re-install on same side.
b. During reassembly, clean reed block.
reed, and stopper plate thoroughly.
Apply a holding agent such as "Lock-
Tite", to threads of Phillips screws.
Tighten each screw gradually to avoid
warping.
-97-