Removing The Reed Valve; Checking The Reed Valve - Yamaha PW50W 2007 Service Manual

REED VALVE

REMOVING THE REED VALVE

1. Remove:
9 Air filter case assembly
9 Carburetor assembly
Refer to "REMOVING THE ENGINE"
2. Remove:
9 Intake manifold
9 Upper valve seat gasket
9 Reed valve assembly
9 Lower valve seat gasket

CHECKING THE REED VALVE

1. Check:
9 Reed valve assembly
Cracks/damage → Replace the reed valve
assembly.
2. Check:
9 Reed valve bending a
Out of specification → Replace the reed
valve.
a b
3. Check:
9 Valve stopper height b
Out of specification → Replace the reed
valve stopper.
5-19
ENG
Reed valve bending limit
0.2 mm (0.01 in)
Reed valve stopper height
4.6-5.0 mm (0.18-0.20 in)
Limit
7.4-7.8 mm (0.291-0.307 in)