Valve Seat - MZ 125 SX Repair Manual

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Valves
6.8.1 Valve Seat
Carbon deposits must be removed from the valve plate and valve
seat.
Inspect the valve seat for pits and wear.
Measure the valve seat width:
Intake:
Exhaust:
1 -2 mm
1 -2 mm
Measurement procedure
The valve that corresponds to the given valve seat must be used
for the measurement process.
1. Apply touch-up paint to the valve plate.
2. Insert the valve into the cylinder head.
3. Press the valve against the valve seat with the valve stem
guide to receive an accurate result.
4. Measure the valve seat width.
The paint is worn off at all points where the valve plate and
valve seat surface come into contact.
If the valve seat is too wide, too narrow or not centred properly,
the valve seat must be reworked.
Fault correction
(A): The valve seat is centred, but too wide.
Valve or valve seat ring worn out.
Replace the cylinder head!
A
(8): The valve seat is centred, but too narrow.
B
c
Valve seat grinder set Goal
Use
45" grinder
even
valve seat width of
at least 1 mm
(e):
Valve seat too narrow and near upper edge.
Valve or valve seat ring worn out.
Replace the cylinder head!
MZ
125 SXlSM Repair
Manual
05/02 165