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1999 yz 400 new topend rebuild

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Well i had my 99 yz 400 topend rebuilt from piston to valves chain cams etc. I went for a ride today and it ran great. but towards the end of the day i started to hear some light valve tap noise. My mechanic told me that it is normal but want to get a second opinion. It starts hot which it never did before and has lots of power!! I love the bike and know its old but it kind f sticks with me. Can anyone help? Thanks

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