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07 crf250 maintenance questions

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Hello evaryone I have some questions about doing some maintenance on this bike.

Yesterday I picked up an 07 crf250 it has 90.1 hours on it, it was bought new raced a bunch of times, it had its oil changes evary 5-6 hours valve adj when needed, I don't believe the motor was ever opened, it runs good and all plenty of power. I just want to see what pep think I should do about checking valves ext. ext.

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90 hours is a long time for a race bike to be left with only valve adjustments and oil changes...

Bikes being used for racing should have pistons changed before 50 hours, and once the valves are adjusted a couple of time it is a sign that new valves are needed...

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