Valve Clearance Adjustment - Generic TR 125 Service Manual

If contacted place is the higher part of valve, please use
a 32° angle plain milling cutter to lower the valve race.
If contacted place is the lower part of valve, please use
a 60° angle internal milling cutter to raise the valve
race.
Grind and cut valve race with a 45° angle precise
milling cutter till it meets the required specification.
After completion of valve race grinding and cutting,
please apply some polishing agent on the surface of
valve. Polish the valve gently.
Installation
Install the cylinder head in the reverse order of removal.
Attention:
While installing valve spring, the end with short spring links heads combustion chamber.
While installing valve collet, please compress valve spring with a valve spring compressor and install the valve
collet.
While installing valve, please apply appropriate amount of engine oil on the surface of valve stem, and then
install it into valve guide.

Valve clearance adjustment

With a special cylinder head cover for valve clearance
adjustment installed, measure the clearance between
the cam base circle and tappet with the testing gauge.
Inlet valve: 0.15-0.2mm
Exhaust valve: 0.2-0.25mm
High contact face
Low contact face
Special cylinder
head cover
- 105 -
32°
60°
Testing gauge