Hi, I have a 2004 outlander 400 H.O. I have been having issues with it starting and staying running. I just changed the spark plug and it started right up the first time. Now the atv will idle just fine without any issues, but the he minute zi press the throttle and attempt to give it any gas, the quad loses power and bogs right now. Once the engine power is reduced significantly, the quad will backfire and power will be restored for a few seconds, then if zip bogs down again and may or may not backfire. Once I let off the throttle it will idle just fine again without any issues. I have been told two different things by two different shops. One says the timing is off which I have no idea how to fix, the other says it just needs to have the carb cleaned. It only has 600 miles /93 hours on it. All fuel lines have been replaced too.