Hey Guys, I am having some low RPM problems with my 250. The problem is that when the bike comes down off throttle it will make a kung kung kung noise. I have checked all the usual suspects, leaky main seals, rod bearings, jetting, but nothing seems to correct the problem. My bike virtually has no idle at all and increasing the idle only makes the problem worse. I tried jetting richer on the PJ, but does not help at all. I have also read other posts, but their problem went away with the addition of the PWK Carb. Mine didn't. It also did this when it was all stock as well. At the point where I am sick of throwing money at this thing trying to fix it. Here are the specs of the bike. 07 CR250 PWK Airstriker Carb - 45pj, 180 mj, needle in 3rd clip JD blue needle Pro Circuit Head and Cylinder mods - runs on 110 sunoco mixed 32:1 with Maxima Castor 927 BR9EG Plug V-Force Reeds OEM Piston Plug is blackish to dark brown and dry when doing plug check.