I have a steel frame 06 wr450 which I brought as new old stock just over 2 years ago. Its got about 160 hours on it now (original piston) and I have discovered a couple of inlet valves are a couple of thou under minimum spec (been checked a couple of times previously and were always ok).
Do I
a/ re-shim them and assume its all good and throw a new piston in at some future time (I have a JE piston kit sitting here).
b/ pull the head off to see why the valves are tight and throw the new piston in and expect the bike to last another 150 or so hours without any 'big bangs'
c/ decide its only going to cost more and more as it gets older so I tart it up and sell it and buy a low hour minter.
is 300 hrs realistic out of the bottom end/gearbox? (it gets regularly properly serviced)
bike is used for trail riding by a slow old fart.
thanks
Mark
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