First of all,this is a great,informative site! I bought a new 06 VTX 1300s about two months ago, and have had a `rap` or knock on acceleration since I drove it off the stealer`s lot. By all I have read here,it seems that this is normal.I have let the dealer`s tech ride it, and he says that nothing sounds unusual.I am a auto tech by trade,and if I heard thid noise in something with four wheels it would be torn apart for inspection.I guess what I am looking for is some reassurance that this should not become a problem when the warranty runs out. I switched to Amzoil at 2500 miles.Shifts better now. Nice running bike,just a bit concerned about the noise.Thanks in advance for your responses.