Hi everyone, i bought a 2005 kfx400 thats in need of some attention. First, it back fires like crazy, and bogs down once its hot, what can cause this? And what are some solutions? It has an pro circuit t4 slip on, but the last owner never jetted the carb, is that a must with a new pipe set up? In the near future im looking to upgrade a few things, valves, cams, jet it, port and polish. Any brands that are recommended for any of those? And is there anything else recommended to do to it to make it really shine? I will mainly trail ride, but there are many straights to catch speed by me. Any help would be great, thank you