49
ATV1013A
2. The lobe heights must be greater than minimum
specifications.
Inspecting Camshaft Bearing
Journal
1. Inspect the bearing journal for scoring, seizure
marks, or pitting.
2. If excessive scoring, seizure marks, or pitting is
found, the cylinder head assembly must be replaced.
NOTE: If the journals are worn, replace the cam-
shaft.
Inspecting Camshaft Spring/Drive
Pin
1. Inspect the spring and unloader pin for damage.
CF061A
NOTE: With the weight extended, the unloader pin
should be flat-side out; with the weight retracted, the
unloader pin should be round-side out.
CF060A
2. If damaged, the camshaft must be replaced.
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 con-
necting rod making sure there is a circlip on each side.
FI626
NOTE: The piston should be installed so the IN
points towards the intake side.
2. Place the two alignment pins into position. Place a new
cylinder gasket into position; then place a piston holder
(or suitable substitute) beneath the piston skirt and
square the piston in respect to the crankcase.
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