Checking The Reed Valve; Installing The Reed Valve - Yamaha MBK YQ100 Service Manual

REED VALVE
YP600051

CHECKING THE REED VALVE

1.Inspect :
• Caburetor joint
Damage/Cracks → Replace.
• Reed valve
Fatigue/Cracks → Replace.
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Inspection steps :
• Visually inspect the reed valve.
NOTE:
Correct reed valve should fit flush or nearly flush
against valve seat.
• If in doubt as to sealing ability, apply suction to
carburetor side of assembly.
• Leakage should be slight to moderate.
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2.Measure :
• Valve stopper height
Out of specification → Replace valve stopper.
322023
3.Measure :
• Reed valve clearance
Out of specification → Replace reed valve.
322024

INSTALLING THE REED VALVE

Reserve the removal procedure.
Note the following points.
1. Install :
• Gasket
2.Tighten :
• Reed valve securing bolts
NOTE:
Tighten the bolts gradually to avoid warping.
5-9
CARB
Valve stopper height
6.0 ~ 6.4 mm
Reed valve clearance
Less than 0.2 mm
11Nm (1.1 m•kg)
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