I have an 05 crf450r that has 5 hrs on a complete top and bottom engine rebuild. It starts first or second kick every time hot or cold. However, once every other ride when the bike is hot it won't start. I've been stuck in the woods kicking it for an hour twice. I'm wondering if it might be electrical or maybe a carb issue where the bike is badly flooding. It seems like I have to let the bike cool down to get it to start. The bike runs amazing but I need to end this intermittent starting issue. Any thoughts?