2008 king quad 400 problems
Just a couple thoughts. Have you checked the fuel level? I know this sounds stupid, but I spent 30mins troubleshooting my Eiger after tearing down a carb when it would idle fine until I hit the throttle. As soon as I'd hit the throttle it would die. Turns out I was low in fuel...enough to idle, but not enough to flow fast to the carb. Also, I would check the vent lines to the carb and and fuel tank. (I'm assuming here that your KQ is set up similar to my 06 Eiger) If you suck a seed into one of those vacuum lines, it's slow flow of fuel from the tank or into the carb. I've also heard about the vent line from the carb to under the seat is prone to kinking and causing issues. If all else fails, pop open a cold one and tear the carb down again...check the pilot jet and main carb...you may also want to adjust the fuel/air mixture screw as well...may be a bit lean on idle-1/8 throttle. Last idea I have is the idle...I don't know what temp you are currently at, but I typically have to raise my idle a bit when it is cold until everything is up and running for a while, especially if I'm plowing and have a huge drain on the battery. Hopefully this helps a bit. By the way, nice quad...what size tires did you put on? Also noticed you mentioned a K&N filter...did you mod the main jet and exhaust as well? If not, you may want to bump up the main jet to offset the increased airflow and richen up the mixture. Worst case, if you were running extremely lean from the increased airflow, you may have burnt the valves.
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