Release 00 - 03/2018
Engine RS100 - RSC100
page 59
Service manual
15. ENGINE BLOCK - Overhauling internal parts
15.5 Overhauling the valves
NOTE - These paragraphs describe all the
operations for checking and overhauling the
valves;
it is left to the operator to assess the advisabi-
lity of performing all the operations described
or only part of them, depending on the type
of engine problems encountered.
1 - Remove the starter assembly [
6.1].
2 - Open the crank case [ 15.2] and remove
the piston [ 15.4].
3 - Move the rocker arms (40); press down the spring
seal cap (41) and move it sideways to remove from
the valve stem (42).
IMPORTANT - The intake and exhaust valves are of
different sizes.
4 - Use an emery cloth to remove all incrustations
from the valve head and check the thickness of the
rim (A); the valve must be replaced if the margin (A)
is less than 0,6 mm or if it shows signs of burning.
5 - Check the diameter of stem (B) in several points
and replace the valve if it is less than the following,
even if only in one point:
5,45 mm (inlet - IN)
5,42 mm (exhaust - EX)
A
B
40
41
42
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