i have a 1994 polaris indy 440 supersport. she will start up on any normal morning and run like a beut. i can get off go inside for somehting and start it right up if its only been sitting about 10 minutes. but. if she sits for over a half hour and the engine cools back down it wont start uup easily. i always need to replace the plugs and keep pulling then she comes to life. any clue on the problem?