Hello, my name's kevin. About a month ago bought a 400ex 440 big bore kit. Brand unknown lrd pro 4 series exhaust k&n filter, intake, boot and. Box looks stock. I'm New to the whole atv 4stroke motor. I have decent understanding of how things work, when they work and symptoms if improperly working. I will however be honest and have very little experience on actually doing the work. Well that's why I'm here. I want to learn. Hands on may be the fastest way, but before I start pulling this thing apart I want to know more of what I'm looking for. First things first. Where do I post a New thread on motor problems without being off-topic. Thanks for reading any help to this site would be great.