Hello, my yz450 has recently become difficult to start. I kick the bike over, and it will run for a few seconds, then stall. I tried increasing the idle, and it allows the bike time to warm up then i turn it back down, and sometimes when i give it some throttle it will stall (wont start at all with some choke). Perhaps its an issue with my jetting? Never had the problem when i first got the bike a couple of months ago. Also the bike has sat for 2 weeks, maybe this is the problem? Some help would be greatly appreciated.