Long time lerker first time poster. I have a 2005 450 as stated, and i am having a little bit of a problem. It ran good last year, brought it outta of storage this year and on one of my first rides it started acting up. My problem is, I can start my bike as usual. I let it warm up a little bit on choke, and the i can ride it around slow jus putting throw the gears. I have a Trail Tech Vector installed to tell rpms and speed and all that good stuff so i can tell my rpms correctly. When I rev the bike the rpms will go up as normal but coming down it will hang around 4,000 rpms for a few seconds then go down to normal idle. Also if I take the bike out and crack it wide open and run it through the gears that way it will run really good then as soon as i let up for a turn or sumthing it will start backfiring horribly and then shut off. i've tried unplugging the TPS without any change. Any ideas or has anyone had this problem?? I've been trying to figure this out for 2 weeks now. Took it to the shop to have the valves adjusted so I dont think that is my problem and I have tried a smaller pilot jet thinking my low end was rich but it didnt change anything. Tried moving my clip, adjusting the a/f screw. Nothing I have tried has worked. PLEASE HELP!!!