3-13
3
YT127
Installing Top-Side
Components
A. PISTON
B. CYLINDER
1. Lubricate the piston pin, connecting rod, and piston
pin bore with motor oil; then install the piston on
the connecting rod making sure there is a circlip on
each side and the open end of the circlip is directed
upwards or downwards.
NOTE: The piston should be installed so the
word “IN” points upward.
YT161
YT159
2. Place the two alignment pins into position. Place a
new cylinder gasket into position; then place a pis-
ton holder (or suitable substitute) beneath the pis-
ton skirt and square the piston in respect to the
crankcase.
YT161A
3. Lubricate the inside wall of the cylinder; then
using a ring compressor or the fingers, compress
the rings and slide the cylinder over the piston.
Route the cam chain up through the cylinder cam
chain housing; then remove the piston holder and
seat the cylinder firmly on the crankcase.
YT158
C. CYLINDER HEAD/CAMSHAFT
D. CAMSHAFT HOLDER/
ROCKER ARMS
NOTE: Steps 1-3 in the preceding sub-section
must precede this procedure.
4. While keeping tension on the cam chain, place the
front cam chain guide into the cylinder.
CAUTION
The cylinder should slide on easily. Do not force the
cylinder or damage to the piston, rings, cylinder, or
crankshaft assembly may occur.
CAUTION
Care should be taken that the bottom of the chain
guide is secured in the crankcase boss.
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