Yamaha XC200T Service Manual page 84

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Troubleshooting
This troubleshooting table describes abnormal noises caused by the valve lifter(s)o
NOTE:
This engine may create some valve noise when started, After few seconds, the noise will be eliminat-
ed when the valve lifter assembly is lubricated,
PROBABLE CAUSE DESCRIPTION REMEDY
Deterioration of engine oil, Oi! leak from hydraulic valve lifter Replace engine oil,
becomes greater due to low viscosity of Replace oil filter as required,
engine oil,
This causes plunger to move
excessively in lifter body, making
excesive noise. _................
Block of oil gallery. Lack of oil supply" to hydraulic valve Repiaoe engh}e oiJ and oil
lifter causes excessive movement of filter: Check and clean oil
plunger in hydraulic valve tifter, passages,
NOTE: Oil is supplied to valve lifter throu! h Small orifice 2 mm (0.08 in)
in oil filter chamber,
Therefore, if oil filter is damaged, this orifice can be easily
blocked by foreign particles,
_nsufficient sealing in valve _f check ball or ball seat is damaged oil Check hydraulic valve lifter
lifter° leak from high pressure chamber and replace as required°
I becomes greater. This causes excessive
] movement of plunger in hydraulic valve
lifter.
If inner spring(s) is broken, valve lifter
.....j does not operate properly,
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