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Measuring length of free spring.
Reference dimensions for processing and fitting
valve guide.
SPRINGS
Each valve is retained by a spring. The leng-
th of these springs must be checked while
they are loose:
service limit = 42,5mm
Should the springs be shorter, have them
replaced.
VALVE GUIDES, VALVES
AND SEATS
Make sure that the valve guides are free
from scratches or any type of nicks. To check
the correct diameter, introduce the gauge in
the valve guides from the side of the com-
bustion chamber (code 006140180 000). If
the gauge can enter, the valve guide must
be replaced at a rectification workshop.
To this purpose, keep to the data carried in
the drawing.
Remember that if replacing the valve gui-
des, the seats of the valves must be repas-
sed as described later on.
Brush the valve mushroom head thoroughly
and degrease the entire valve.
Make sure that the valve stems are free from
scratches or any type of nicks. Measure the
diameter of the valve stems, making sure it
is not less than the service limit:
Valve stem diameter service limit:
5,95mm
If it is, replace the valve. Play between the
valve and the valve guide must not be grea-
ter than the limit carried below:
Play limit between valve and valve guide:
0,08mm
If play is greater, first try to replace the valve.
Should play still not be within the aforementio-
ned limits, intervene on the valve guide.Check
the valve mushroom head zone, making sure
that the area of contact with the seat is not den-
ted: if so, replace the valve.
Check the state of wear of the valve seats and
the sealing surface. In order to do this, apply a
light layer of Prussian blue paint on the contact
zone of the valve with the seat. Then insert the
guide valve until you press it against the seat and
turn it on its own axis.
2
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.4.1
2
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.4.2
Содержание Enduro RR 350 2013
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