Service Manual

17
Note: Do not remove the retainer (1) while the
head is still on the engine or the valves will drop
down into the cylinder.
Remove valve rotators (7). Press down on
retainer (1) and move it to the side so that the
valve stem will pass through the larger hole.
Remove valve spring (2) and exhaust valve (5).
Repeat the process for the intake valve (4) and
retainer..
Valve Springs:
Check the free length of the valve spring. The
normal free length is 39.4mm. If the free length
is 38.0mm or less, replace the spring.
Model: Normal: Minimum:
RP1200E 39.4mm 38.0mm
Valve Guides:
Inspect the valve guides. Make sure that they fit
tightly into the cylinder head. Inspect the inner
surfaces of the valve guides. The inner surface
should be smooth, with no cracking or pitting. If
the inner surface is damaged, replace the valve
guide.
Valve Guides – Ream:
For best results perform this procedure when the
valve guides and cylinder head are at room
temperature.
Make sure that the reamer is centered over the
valve guide. Coat the reamer and valve guide
with cutting oil. Turn the reamer clockwise and
work it through the valve guide for the entire
length of the reamer. Continue to turn it
clockwise as you remove the reamer from the
valve guide. Remove any carbon deposits and
check the internal diameter of the valve guide.
The normal diameter of the valve guide is
6.50mm. If the internal diameter of the valve
guide is 6.562mm or more, either replace the
valve guide or install inserts.
Check the valve guide bore. Insert the valve and
make sure that it moves smoothly through the
bore without any wobble. Figure 1 shows a good
valve guide. Figure 2 shows a valve guide with
abnormal wear that would allow the valve to
wobble. The valve head could eventually break
off and fall into the combustion chamber,
damaging the engine. This valve guide must be
reamed or replaced. Figure 3 shows a valve
guide with a bore that is not centered. This valve
guide must be replaced.
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