Yamaha TTR125LM, Owner'S Service Manual

Page: 234 / 468

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ENG
VALVES AND VALVE SPRINGS
REMOVAL POINTS
Valve
1. Check:
●
Valve sealing
Leakage at the valve seat
→
Inspect
the valve face, valve seat and valve
seat width.
Checking steps:
●
Pour a clean solvent 1 into the intake and
exhaust ports.
●
Check that the valve seals properly.
There should be no leakage at the valve
seat
2 .
2. Remove:
●
Valve cotters 1
NOTE:
Attach a valve spring compressor 2 between
the valve spring retainer and the cylinder head
to remove the valve cotters.
Valve spring compressor:
YM-04019/90890-04019
3. Remove:
●
Valve spring retainer 1
●
Valve spring 2
●
Valve 3
●
Valve stem seal 4
●
Valve spring seat 5
NOTE:
Identify the position of each part very carefully
so that it can be reinstalled in its original place.