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Post #3 of this thread has link to manuals. I have a 2019 but pretty sure 2018 is very similar, if not exact. Pages 250 - 258 have the disassembly, check, adjust, and reassembly instructions for valve clearances. I didn't think it would be that difficult - gotta love single cylinder engines!! I was mostly happy to see that the engine does not have be be dropped.
Anyway, think I'll call the dealer tomorrow and see what they say regarding warranty. If they say no, well, it's a 3-day weekend coming up - should have time to fix it (if indeed it's just the valves) and ride too.
 

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I had a similar noise when I had loose cam tensioner. Readjust the tensioner.

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