PIAGGIO Beverly 400 E5 - Page 39

Specification Desc./Quantity
Limit allowed: (0.003)in (0.1)mm
- Check that there are no signs of wear on the
mating surface with the set screw articulated ter-
minal.
- If no anomalies are found during the above
checks, you can use the same valves. To obtain
better sealing performance, grind the valve seats.
Grind the valves gently with a fine-grained lapping
compound. During the grinding, keep the cylinder
head with the valve axes in a horizontal position.
This will prevent the lapping compound residues
from penetrating between the valve stem and the
guide (see figure).
CAUTION
TO AVOID SCORING THE MATING SURFACE, DO NOT ROTATE 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 REVERSE THE FITTING POSITIONS OF THE VALVES (RIGHT - LEFT).
- Check that the camshaft bearings exhibit no scores or abnormal wear.
- Using a micrometer, measure the camshaft bearings.
STANDARD DIAMETER
Specification Desc./Quantity
Camshaft check: Standard diameter Bearing A Ø: (1.454÷1.455)in (36.95÷36.975)mm
Camshaft check: Standard diameter Bearing B diameter: (0.707-0.708)in (17.966-17.984) mm
MINIMUM DIAMETER PERMITTED
Specification Desc./Quantity
Camshaft check: Minimum diameter permitted Bearing A Ø: (1.454)in (36.94)mm
Camshaft check: Minimum diameter permitted Bearing B diameter: (0.7069)in (17.957)mm
Beverly 400 E5 Technical Data
DT - 39