I have got a 2003 WR 450f. When I am out riding and it is warm it can be difficult to start. Using the electric start, sometimes it starts right up. Other times it seems to take a lot of cranking to start it up. I use the hot-start lever and that sometimes seems to help but not always. Seems like if it doesn't start on the 1st try, it takes quite a bit to get it going. Any ideas on what would be causing this?