Recently for the past 3 weeks or so my bike has gotten sick.. it started knocking/popping when slow releasing out of first with little to no gas applied. If im hauling ass it dont knock. Today i was 2nd and was just making my way around the parking lot(really should of been in 1st) and it was popping bad when the bike began to bog down due to the low rpms/speed for 2nd. So im concluding after weeks of trying to find the cause, this only happens when the bike is "bogged" down.. usually below 3k rpm 1st and 2nd gear...haven't tested any higher gears cause being in 3rd and going 10mph is just ignorant lol. Me and a buddy are gonna look at it again this afternoon but ideas of what to look at or for will be awesome! Bike has 19k miles and just changed the oil with mobile 1 4t racing synthetic.