Yamaha XV19SX(C), Service Manual

Page: 118 / 494

ENGINE
3-5
8. Remove:
• Fuel tank damper “1”
• Cylinder head breather hose “2”
9. Disconnect:
• Oil tank breather hose “3”
• Fuel outlet hose “4”
10.Remove:
• Front cylinder head cover “1”
• Rear cylinder head cover “2”
NOTE:
Due to the small clearance between the frame
and the rear cylinder head cover, the three bolts
“3” cannot be removed when the cover is in
place. Loosen the bolts, and then remove the
cylinder head cover from the right side of the ve-
hicle, making sure that the bolts do not scratch
the rocker arms or other engine parts.
11.Measure:
• Valve clearance
Out of specification
→
Adjust.
▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼
Piston #1 TDC (rear cylinder)
a. Turn the crankshaft counterclockwise.
b. When piston #1 is at TDC on the compres-
sion stroke, align the TDC mark “a” on the
crankshaft position sensor rotor with the
pointer “b” on the clutch cover.
c. Check the camshaft drive gear mark “c” posi-
tion and camshaft driven gear mark “d” posi-
tion as shown.
If the marks are not aligned, turn the crank-
shaft counterclockwise 360 degrees and re-
check step (b).
1
1
2
3
4
2
1
Valve clearance (cold)
Intake
0.00–0.04 mm (0.0000–0.0016 in)
Exhaust
0.00–0.04 mm (0.0000–0.0016 in)
2
3
3
b
a