Inspecting The Springs And Half-Cones; Refitting The Valves - VESPA ET4 50 Workshop Manual

ET4 50
grinding, keep the cylinder head in a horizontal position. This will prevent the lapping compound resi-
dues from penetrating between the valve stem/guide coupling.
CAUTION
TO AVOID SCORING THE CONTACT SURFACE, DO NOT KEEP ROTATING 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.

Inspecting the springs and half-cones

- Check that the upper spring caps and the cotter
halves show no signs of abnormal wear.

Refitting the valves

- Lubricate the valve guides with graphite grease.
- Place the lower plates of the valve spring on the
head.
- Use the punch to fit the 2 sealing rings one at a
time.
Specific tooling
020306Y Punch for assembling valve seal
rings
- Fit the valves, the springs and the upper plates.
- Using the appropriate tool, compress the springs
and insert the cotters in their seats.
Engine
ENG - 93