Cylinder Heads; Cylinder Head Inspection - Yamaha XVS650 Service Manual

CYLINDER HEADS
ENG
b
6.Remove:
• Cylinder head
NOTE:
• Loosen the bolts and nuts in the proper
sequence.
• Follow the numerical order shown in the
illustration. Loosen each bolt 1/4 of a turn
at a time until all of the bolts are loose.
Front cylinder head
NOTE: _
When removing the front cylinder head
camshafts, repeat the rear cylinder head
camshafts removal procedures. However,
note the following points.
1.Align:
• Ill" mark
(with the stationary pointer)
**********************************
Removal steps:
• Turn the crankshaft clockwise 290°.
• Align the "1" mark
@
with the stationary
pointer
C6>
on the crankcase cover Oeft)
when the front piston is at TOC on the
compression stroke.
• When the
III"
mark is aligned with the station-
ary pointer the punch mark
©
on the cam-
shaft sprocket should be aligned with the
stationary pointer @ on the cylinder head.
• The front piston is at TOC on the compres-
sion stroke when there is clearance at
both of the rocker arms. If there is no
clearance then turn the crankshaft clock-
wise one full turn.
• Check that the front piston is at TOC in the
compression stroke.
**********************************
CYLINDER HEAD II\I$pECTION
1.Eliminate:
• Carbon deposits (from the combustion
chambers)
Use a rounded scraper.
NOTE: _
00 not use a sharp instrument to avoid
damaging or scratching:
• Spark plug threads
• Valve seats
2.lnspect
• Cylinder heads
Scratches/damage
-7
Replace.
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