Lol, all motors do make noise that is true. I just picked up a used 17 AT and mine too make an almost chain tensioner noise at 2k rmp in 2nd, 3rd gear. It's not a normal sounds as a friend of mine has the same one with 17k miles and sounds super tight, zero noise. I've been riding for 44 years and have wrenched on motos for years. I'd sure love to know if there's anyone else out there with this same issue before diving down a rabbit hole!All motors make noise, rc51 v twin make's a different valve noise, the gear drive v-4 vfr valve train make a different noise, and this motor is parallel twin 270 crank unicam and it makes a different noise, it is a off beat noise, and it makes great torque. Honda know motors. Valve noise change's through it's rpm range like all motors. ride it and check valve's at 19,000 kms. [like the service manual say's] This bike give's me a big smile.