Yamaha XZ550RJ 1982 Service Manual page 58

c) Install the camshaft on the cylinder head.
Place a strip of Plastigage between the cam-
shaft and camshaft cap as illustrated (length-
wise along camshaft). Tighten the nuts with
specified torque. Remove the camshaft cap
and determine the clearance by measuring the
width of the flattened Plastigauge.
Cap nut tightening torque:
8 Mm (0.8m-kg, 5.8ft-lb)
NOTE:
Be careful so that the camshaft cap is installed in
the correct position.
NOTE:
Do not turn camshaft when measuring clearance
with Plastigage.
Camshaft-to-cap clearance:
Standard: 0.020 ~ 0.061 mm
(0.0008-0.0024 in)
Maximum: 0.160 mm (0.006 in)
d) If the camshaft-to-cap clearance exceeds
specification, measure the camshaft bearing
surface diameter.
Bearing surface diameter:
Standard: 24.96 ~ 24.98 mm
(0.9830 ~ 0.9835 in)
a) If the camshaft diameter is less than speci-
fication, causing excessive clearance, re-
place the camshaft.
b) If the camshaft diameter is within spe-
cification and cam shaft-to-cap clearance is
excessive, replace the cylinder head.
e) Cam chain
Except in cases of oil starvation, the cam
chain wears very little. If the cam chain has
stretched excessively and it is difficult to
keep the proper cam chain tension, the
chain should be replaced.
f) Cam sprocket and cam drive sprocket
a) Check the cam sprocket and cam drive
sprocket for wear.
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