Yamaha XT250X - Removing the Rocker Arms and Camshaft; Checking the Camshaft

CAMSHAFT
5-14
EAS23770
REMOVING THE ROCKER ARMS AND
CAMSHAFT
1. Loosen:
● Locknuts “1”
● Valve clearance adjusting screws “2”
2. Remove:
● Camshaft retainer “3”
3. Remove:
●
Camshaft “1”
NOTE:
● Screw 10-mm bolt “2” into the threaded end of
the camshaft and then pull out the camshaft.
●
Take care not to interfere and damage the
rocker arm.
4. Remove:
● Intake rocker arm shaft
● Exhaust rocker arm shaft
● Rocker arm (Intake and exhaust sides)
NOTE:
Remove the rocker arm using the weight “1” and
slide hammer bolt “2”.
EAS23840
CHECKING THE CAMSHAFT
1. Check:
● Camshaft lobes
Blue discoloration/pitting/scratches → Re-
place the camshaft.
2. Measure:
● Camshaft lobe dimensions “a” and “b”
Out of specification → Replace the camshaft.
Slide hammer bolt
90890-01083
Slide hammer bolt 6 mm
YU-01083-1
Weight
90890-01084
YU-01083-3
Camshaft lobe dimension limit
Intake A
36.520–36.620 mm
(1.4378–1.4417 in)
Limit
36.460 mm (1.4354 in)
Intake B
30.201–30.301 mm
(1.1890–1.1930 in)
Limit
30.151 mm (1.1870 in)
Exhaust A
36.564–36.664 mm
(1.4395–1.4435 in)
Limit
36.514 mm (1.4376 in)
Exhaust B
30.216–30.316 mm
(1.1896–1.1935 in)
Limit
30.166 mm (1.1876 in)