Inspection And Repair; Cylinder Head Cover; Cylinder Head - Yamaha XZ550RJ 1982 Service Manual

10. emove the drive axle bearing stopper bolts;
use the torx driver.
1. Torx driver 2. Stopper bolt
11. Remove the bearing stopper plates, drive
axle, and shims.

INSPECTION AND REPAIR

Cylinder head cover

Place the head cover on a surface plate. There
should be no warpage. Correct by resurfacing as
follows:
Place No. 400 or No. 600 grit wet sandpaper on
surface plate and resurface the head cover using a
figure-eignt sanding pattern. Rotate head cover
several times to avoid removing too much material
from one side.

Cylinder head

1. Remove the cam shaft caps, cam chain
damper, cam shafts, cylinder head nuts,
and washers.
NOTE:
Keep the front cylinder camshaft caps and rear
cylinder camshaft caps separately so they can be
reinstalled in the same cylinder head.
1. Cam shaft cap 2. Cam chain damper
2. Mount the valve spring compressor on the
head and depress each valve spring. Re-
move the valve retainers with a magnet or
tweezers, and remove the valve springs.
3. Remove the valves. Mark each valve so it
can be reinstalled in the same cylinder
head.
NOTE:
Deburr any deformed valve stem ends. Use an oil
stone to smooth the stem end. This will help pre-
vent damage to the valve guide during valve re-
moval.
4. Using a rounded scraper, remove the car-
bon deposits from the combustion cham-
ber. Take care to avoid damaging the spark
plug threads and valve seats. Do not use a
sharp instrument. Avoid scratching the alu-
minum.
5. Check the cylinder head warpage with a
straightedge as shown.
The warpage should not exceed the speci-
fied limit; if necessary, resurface the cylin-
der head. If the warpage exceeds the al-
lowable limit, the cylinder head should be
replaced with a new one.
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