Honda XL350R 1984 Shop Manual page 84

CYLINDER HEADNALVES
NOTE
The location of the valve seat in relation to
the valve face is very important for good seal-
ing.
Apply
Ii
thin coating of Prussian Blue to the valve
seat.
Pren the valve through the valve guide and onto the
seat to make a clear pattern.
Remove to inspect the valV8 . If the contact area is
too high on the valve, the seat must be lowered us-
ing a
32
degree flat cutter.
If the contact area is too low on the valve, the seat
must be raised using a
60
degree inner cutter. Re-
finish the seat to specifications. using a 45 degree
finish cutter.
After cutting the seat, apply lapping compound to
the v81v8 face, and lap the valV8 using light pressure.
After lapping. wash all residual compound off the
cylinder head and valv8.
CAUTION
Take care not to allo w 'he compound to enter
between the valve stem Qnd gl/ide.
6-16
CONTACT TOO HIGH
OLD SEAT WIDTH
CONTACT TOO LOW
VALVE LAPPING TOOL