Join Date: Nov 2018
Location: Texas Hill Country (1hr NW of San Antonio)
Mentioned: 3 Post(s)
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I haven't heard that, but like OldJackBob, I wear ear plugs and full-face helmet, so might be happening and I'm just not noticing. Based on gear and rpm, I wonder if it has something to do with either the airbox intake "flapper" valve or one of the exhaust valves activating/de-activating at that point. I wouldn't worry about it unless you are noticing some drivability issues, too. Sometimes you just want to 'know' what the noise is, even if it's "nothing". I get that. Hopefully someone smarter chimes in with a better answer for you.