APRILIA MSS Mana GT ABS Service Station Manual page 187

MSS Mana GT ABS
- Check that there are no signs of wear on the fay-
ing surface with the set screw articulated end and
that its surface is smooth and not concave.
- If no anomalies are found during the above
checks, the same valves can be reused.
For better sealing results, it is advisable to grind
the valves. Grind the valves gently with fine-
grained lapping compound. Upon grinding, keep
the cylinder head with the valve axles in a hori-
zontal position. This will prevent the lapping com-
pound residues from penetrating into the stem-
valve guide coupling.
CAUTION
TO AVOID SCORING THE FAYING SURFACE, DO NOT RO-
TATE THE VALVE WHEN NO LAPPING COMPOUND IS
LEFT. CAREFULLY WASH THE CYLINDER HEAD AND THE
VALVES WITH A SUITABLE PRODUCT FOR THE TYPE OF
LAPPING COMPOUND BEING USED.
CAUTION
DO NOT CHANGE THE VALVE FITTING POSITION (RH -
LH).
See also
Installing the
cylinder head
Inspecting the valve sealings
- Fit the valves into the cylinder head.
- Alternatively test the intake and exhaust valves.
- The test should be carried out by filling the mani-
fold with fuel and checking that the head does not
ooze through the valves when they are just press-
ed by the fingers.
See also
Installing the
cylinder head
Engine
ENG - 187