PIAGGIO MP3 400 i.e., Service Manual, Page: 157 / 394

INLET
Specification Desc./Quantity
Standard clearance: 0.013 - 0.04 mm
Admissible limit: 0.08 mm
OUTLET
Specification Desc./Quantity
Standard clearance: 0.025 ÷ 0.052 mm
Admissible limit: 0.09 mm
STANDARD VALVE LENGTH
Specification Desc./Quantity
Inlet: 95.0 ± 0.3 mm
Outlet: 94.2 ± 0.3 mm
- Check that there are no signs of wear on the surface of contact with the articulated register terminal.
- If the checks above give no failures, you can use
the same valves. To obtain better sealing perform-
ance, grind the valve seats. Grind the valves gently
with a fine-grained lapping compound. During the
grinding, keep the cylinder head with the valve ax-
es in a horizontal position. This will prevent the
lapping compound residues from penetrating be-
tween the valve stem and the guide (see figure).
CAUTION
MP3 400 i.e.
Engine
ENG - 65