Hi, I have a 2006 kawasaki Stx 12f (4 stroke) that will not start unless you spray starting fluid in the air box.if it has been sitting for a day or so with no use, you have to use starting fluid the first start-up or it won't start.but after that for the rest of the day it always starts on its on without starting fluid.this Is annoying! Can someone please tell what the problem is and or what I need to check to fix it? Any help will be very appreciated.