Valve Adjustment

I bought a used 2000 xr 400. The previous owner said he never adjusted the valves. It has approx. 4,000 miles on it and runs fine. He is the second owner and he bought it when it was a year or two old. So what harm if any was done, should I have them adjusted or just ride on?

The manual calls for initial valve adjustment at 500 miles or so. A new engine will require the adjustment as the valves initially seat and may have zero claerance after a while. This will cause hard starting as the valves may not be closing completely. DO IT!

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