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ENGINE
Assembly
Piston ring
I.
Use the piston rings of the same marking in a set Install
the rings
Lo the piston
so that
the
markings are
facing
upward.
2
When
a new ring is
used,
check it for smooth fit
in
the
piston
ring
groove.
It
should slide freely around
the
entire riiig circumference
without
binding.
3. Position the rings so
that
Lhcir g;1ps of tJ,e
top,
second
and oil rings arc staggered
l
20°,
each
being
apart from
the
direction at right angles
10
the
piston pin.
NOTE:
Oo not install the top and second rings con•
vcr.!cly.
Piston
I. Install the
piston
v,;f.h
the
arrow mark facing toward
the
front ( exhaust side) of the engjne.
2.
Assemble
the
piston,
connecting
rod
and
piston pin with
new piston
pin
clips.
NOTE:
Put a rag or
the
like in the cylinder bore of
the
crank•
case to prevent lite clips from falling
in
the crankcase.
Cylinder
I.
Install two knock pins and cylinder gasket
lo
the
cylinder surface
t>f
the upper crankcase.
2.
Place
"Piston
Bases"
(Tool
No.
07958-2500000)
bet-
ween the pistons and crankcase. Passing the
cam chain
down
through
the
cylinder.
slowly
lower
the cylinder
over
the
pistons.
Hold
the
piston
rings
with "Piston
Ring Compressor,;" (Tool No.
07954-
3230000)
while
lowering
the
cylinder
bore~
Remove the
piston
bas.es and piston
ring compressors.
when the
rings
enter
the cylinder bores.
NOTE:
Liberally
apply elea,1 eogjne oil
to
the
piston rings
before installation.
Cylinder head
t.
Use
"Valve
Guide Driver" (Tool No. 07942-1180100)
when driving a new valve gui<le. After
driving,
ream to
size
with "Valve Guide Reamer" (Tool Nc.
07984-
2000000).
2.
Install
the
valves so
that
the narrow-pitch ends of the
valve
springs
are on the valve spring seal
side.
Fig.
3-
15
(1)
(2)
Fig.
3-
16
fig.
3-17
17
=:mi
Top
ring
I
~2nd.ring
~Oil
ring
Piston head mark
Piston pin (3)
Piston pin clip
Piston base
Piston ring
Cylinder
Valve
guide
driver
Cam
chain
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