Yamaha Wolverine YX70EPNG, Service Manual

Page: 225 / 503

CAMSHAFTS
5-12
EBS30432
REMOVING THE CAMSHAFTS
1. Remove:
• Crankshaft end accessing screw “1”
• Timing mark accessing screw “2”
2. Align:
• Mark “a” on the AC magneto rotor
(with the mark “b” in the AC magneto cover)
▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼
a. Turn the crankshaft counterclockwise.
b. Position the mark “a” on the AC magneto ro-
tor with the mark “b” in the AC magneto cov-
er.
TIP
When the holes “c” in the intake camshaft
sprocket and exhaust camshaft sprocket are po-
sitioned above the cylinder head mating surface
“d” as shown in the illustration, and the marks “e”
and “f” on the sprockets are aligned with the cyl-
inder head mating surface “d”, the piston is at
TDC.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
3. Remove:
• Timing chain tensioner
• Timing chain tensioner gasket
4. Remove:
• Camshaft cap “1”
• Bearing stoppers “2”
NOTICE
ECB02430
• To prevent damage to the cylinder head,
camshafts or camshaft cap, loosen the
camshaft cap bolts in stages and in a criss-
cross pattern, working from the outside in.
• Be sure not to let the bearing stoppers fall
into the crankcase when removing it.
5. Remove:
• Intake camshaft “1”
• Exhaust camshaft “2”
TIP
To prevent the timing chain from coming off the
crankshaft sprocket, fasten it with a wire “3”.
1
2
a
b
e
e
f f c c
d
1
2