Yamaha YFM90RA Model Vehicle User Manual


 
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ENG
CAMSHAFT, ROCKER ARMS AND VALVES
EBS00237
REMOVING THE ROCKER ARMS AND
CAMSHAFT
1. Loosen:
locknuts
screw, valve adjusting
2. Remove:
intake rocker arm shaft
exhaust rocker arm shaft
intake rocker arm
exhaust rocker arm
TIP
Remove the rocker arm shafts with the slide
hammer bolt and weight .
3. Remove:
camshaft comp.
Slide hammer set
P/N. YU-01083-A
Slide hammer bolt (M5)
P/N. 90890-04158
YM-04158
Weight
P/N. 90890-01084
EBS00238
REMOVING THE VALVES AND VALVE
SPRINGS
1. Check:
valve sealing
Leakage at the valve seat
Check the
valve face, valve seat and valve seat width.
Refer to “CHECKING THE VALVES AND
VALVE SPRINGS”.
a. Pour a clean solvent into the intake and
exhaust ports.
b. Check that the valve seals properly.
There should be no leakage at the valve
seat .