Yamaha XN125 2000, Service Manual

Page: 101 / 259

ENG
4-5
CAMSHAFT
EAS00197
REMOVING THE ROCKER ARMS AND CAMSHAFT
1. Align:
• “T” mark on the generator rotor
(with the mark on the generator rotor cover)
왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔 왔
a. Turn the crankshaft counterclockwise.
b. When the piston is at TDC on the compres-
sion stroke, align the “T” mark a on the
generator rotor with the mark b on the
crankcase.
NOTE:
TDC on the compression stroke can be found
when the camshaft lobes are turned away from
each other.
왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖 왖
2. Loosen:
• locknuts
• adjusting screws
3. Remove:
• timing chain tensioner assembly
NOTE:
Remove the timing chain tensioner adjusting
screw and spring to release the spring tension
and then remove the timing chain tensioner
body.
4. Remove:
• bolt
• camshaft sprocket
• Rocker arms shaft
5. Remove:
• camshaft retaining plate and bolt
• camshaft
Slide hammer bolt
90890-01083 (M6)
Weight
90890-01084
6. Remove:
• rocker arms
EAS00205
CHECKING THE CAMSHAFT
1. Check:
• camshaft bearings
Damage/wear
→
Replace.
2. Check:
• camshaft lobes
Blue discoloration/pitting/scratches
→
Re-
place the camshaft.
b
a