I have a 2005 Big Bear 400. It got hot one time and ever since it almost refuses to start at first. Once it starts, it will usually start fine on sequential starts. If it sits for a half hour or so it is hard to start again. It is not a fuel issue. I have had it at 2 authorized Yamaha dealers and one Kawasaki dealer. I am the proud new owner of 2 perfectly fine CDI boxes, and a fully services 4 wheeler that will hardly start. Does anybody have any ideas?