Checking The Camshafts - Yamaha MIO Service Manual

CAMSHAFT
EAS00205

CHECKING THE CAMSHAFTS

1. Check:
• camshaft lobes
Blue discoloration/pitting/scratches
Replace the camshaft.
2. Measure:
• camshaft lobe dimensions a and b
Out of specification → Replace the cam-
shaft.
Camshaft lobe dimension limit
Intake
a 25.881 ~ 25.981 mm
(1.0189 ~ 1.0229 in)
<Limit>: 25.780 mm (1.0150 in)
b 21.195 ~ 21.295 mm
(0.8344 ~ 0.8384 in)
<Limit>: 21.095 mm (0.8305 in)
Exhaust
a 25.841 ~ 25.941 mm
(1.0174 ~ 1.0213 in)
<Limit>: 25.740 mm (1.0134 in)
b 21.050 ~ 21.150 mm
(0.8287 ~ 0.8327 in)
<Limit>: 20.950 mm (0.8248 in)
3. Check:
• camshaft oil passage
Obstruction → Blow out with compressed
air.
4 - 19
ENG
→