Hi. I recently purchased a 2006 400. It has an HMF pipe and jets I'm assuming. The kid I got it from is 16. I don't think he put everything in right. When I got it it ran ok but it was winter and I didn't use it much. I started it up a few times for this and that and it ran. Now it starts and won't idle. It will run wide open, but no idle. As soon as I let off the throttle it dies. I'm guessing it needs a good cleaning. Probably idle circuit. I'm not a fan of mods myself. Honda is smart and I think things should be left alone, but that's me. The quad is fast enough and I don't ride trails. I live in NH and I ride on mine and neighbor's property so I wanna get rid of the loud pipe. I have the stock pipe to it. My question is can I just buy a rebuild kit and rebuild carb to stock and put stock pipe back on and get back to normal? No other mods on quad. I'm very mechanical, but never rebuilt a quad car so I don't know much about jetting. Thanks. I tried to find answers before asking, but all questions are more about modding than going backwards.