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Valve check/adjustments should have been done at 7500 miles. Oil change every 2-3k Miles. Dependent on your riding style. There's a maintenance checklist in the DIY TECH section.
Valve check adjustment may sound daunting at first but I would advise you read through it a few times and see if you can tackle it. Otherwise have someone that knows help your or pay someone to do it. Tires should be checked at least weekly and make sure you don't have dry rot, cracks, or nails/screws in them.
Ringing could just be normal or you have something rattling loose. Gear up and keep our head on a swivel and practice safety maneuvers and skills.
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