Considering how many failures have been occurring here on the forum that are valve related, I'm going to start just suggesting the factory recommendation. I've never been around a vehicle that actually needed that much check up on something like valves. But it's certainly easier than having to replace the head.
I had mine for roughly 8,000 miles and I only did the post break-in inspection. There are guys who have been riding their GZs for years and only ever done the initial check. But I guess somewhere along the way the law of percentages was bound to catch up with us.
Check your valve clearances every 3,000-5,000 miles.
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