Yamaha XZ550RJ 1982 Service Manual page 88

7. Slide the sprocket so that the channel
(marked with I) in the sprocket fits over the
locating pin on the intake camshaft. Like-
wise, fit the channel (marked with E) in the
sprocket over the locating pin on the ex-
haust camshaft.
8. Insert your finger into the hole in the cam
chain tensioner and push the cam chain
guide inward. While pushing it, make
sure the punch marks on the camshafts
align with the marks on the caps. Also make
sure that the cam lobes face each other.
9. If the marks are not aligned, remove the
sprockets from the camshafts, and change
the position at which the sprockets mesh
with the cam chain, then mount the sprock-
ets on the camshafts.
10. Release the cam chain tensioner oneway,
cam, and insert the tension rod into the ten-
sion body.
I. One-way cam
11. Install the tension body into the front cylin-
der head. Use a new gasket and, torque the
bolts to specification.
Tightening torque:
12Nm(1.2m - kg, 8.7ft-lb)
12. Install the tension spring into the tension
body. Torque the end plug to specification.
Tightening torque:
20Nm(2.0mkg, 14ft-lb)
13. Hold the center of the camshaft with a
22mm (0.87 in) open-end wrench, and
torque the cam sprocket securing bolt to
specification.
Tightening torque:
70 Nm (7.0m-kg, 5.0ft-lb)
14. Turn the crankshaft 290 degrees counter
clockwise, and align the I mark on the fly-
wheel with the stationary pointer. This
places the rear (#2) piston at top dead cen-
ter.
NOTE:
Be sure to keep the cam chain taut while turning
the crankshaft.
2. Tension rod 3. Tension body
88