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TR2/3/3A Knock knock... what's this?

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The hollow knock goes away completely with a little throttle as well as when it's warm, I suspect the original knock was two (or more) issues. I would hear the knock go away before, but perhaps it was just 1/2 of it. Irregardless, I am playing around with the timing in case it's a sort of ping or *pink* as they say in the U.K. (Makes a bit more sense). I went for a rip this evening and she just purrs. I'll get a video up shortly.
 
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