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Crf450r valves

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Pretty new to the whole four stroke thug so can someone explain what I gotta do when I change my valves. I especially need help in the number part. As in what do I need to order and what math I gotta do to get the right shim thanks

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When the time comes all you have to is take head off and send it to (search on web, lots of companies rebuilding dirtbike heads) have them cut seats and install SS valves and they will shim them before sending it back.

If seats aren't cut and reshaped your just waisting your time putting in new valves.

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I think it is better sending it out.  I just sent mine to fastheads and they were excellent in customer service.  I did the math and the parts and its only about a $150 difference from doing it yourself.  Thats if you have all the equipment to do it.

They will cut the seat, make sure you have the right height and test for any leaks....hard to beat it.

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