Removing The Camshaft; Checking The Camshaft - Yamaha R15 2022 Service Manual

EAS30256

REMOVING THE CAMSHAFT

1. Loosen:
• Locknut "1"
• Valve clearance adjusting screw "2" (intake/
exhaust)
2
1
2. Remove:
• Camshaft assembly "1"
• Align the holes "a" in intake rocker arm 1 "2"
and intake rocker arm 2 "3", and then push
the intake rocker arm stopper pin "4" in the di-
rection of the arrow shown in the illustration.
• While pushing intake rocker arm 1 "5" and in-
take rocker arm 2 "6" in the direction of the ar-
row shown in the illustration, remove the
camshaft assembly.
4
3
TIP
Screw the long cylinder head bolt "7" into the
threaded end of the camshaft and then pull out
the camshaft.
5
6
EAS30257

CHECKING THE CAMSHAFT

1. Check:
2. Measure:
a
3. Check:
2
1
7
5-17
CAMSHAFT
• Camshaft lobes
Blue discoloration/pitting/scratches → Re-
place the camshaft.
• Camshaft lobe dimensions "a"
Out of specification → Replace the camshaft.
Camshaft lobe dimensions
Lobe height (Intake)
Limit
32.268 mm (1.2704 in)
Lobe height (Intake high speed)
Limit
32.332 mm (1.2729 in)
Lobe height (Exhaust)
Limit
29.516 mm (1.1620 in)
G088946
• Camshaft oil passage
Obstruction → Blow out with compressed air.
ENG