I have personally burned valves on a new one at 3000 miles. Don't set them as close as the service manual says, use .004"-.006" and shooting for .005" and they last MUCH longer. The service manual allows for .002"-.004" and .002" turns out to be zero when the engine is running and they burn. You throw away a solid .002" of whatever measurement you get as it is not real.
Brand new bikes were supposed to recheck/set valves at 600 miles after run-in but most of them never got it, then every 4000 after that. Setting at the service manual numbers may not make 4000, the going to .005" definitely does and can go to as long as 24000 before problems, I have done it.
The cam caps are looser than the valve clearances and it allows the fairly strong valve springs to push the cams around in the caps while hand turning the motor to make your measured number not be what is real at engine running. Where the .002" went.
OEM compression number is 170 psi.
Remove or defeat the idle limiter caps and adjust the mixture screws to 2- 2 1/2 turns and the bike will idle better and pull away a bit better.