Yamaha WaveRunner FX140 Manuel D'entretien page 370

POWR
VALVES AND VALVE SPRINGS
9. Apply a thin, even layer of lapping com-
pound onto the valve seat, and then lap
the valve using a valve lapper (commer-
cially obtainable).
CAUTION:
Do not get the lapping compound on the
valve stem and valve guide.
10. After every lapping procedure, be sure to
clean off any remaining lapping compound
from the cylinder head and the valve.
11. Check the valve seat contact area of the
valve again.
Valve installation
1. Install:
• Lower spring seat 1
• Oil seal 2
• Valve 3
• Valve spring 4
• Upper spring seat 5
(into the cylinder head)
NOTE:
• Make sure that each valve is installed in its
original place.
embossed marks.
Right and left intake valve(-s): "4XV:"
Middle intake valve(-s): "4XV."
Exhaust valve(-s): "5LV"
• Install the valve spring with the larger pitch
a facing up.
b Smaller pitch
5-75
Refer to the following
E