I have a 87' Big Bear. The thing starts right up idles great revs and all until it gets warm. As soon as it gets warm it will still idle perfect but if you try to roll into the throttle it will start to load up and not run right and die if your in gear. If you rev it quickly it will rev right up ok. I've been through the carb 3 times and just can't figure it out. New plug in it too. I'm starting to think possibly the coil is going bad? Any ideas anyone.

 

if its not getting to much fuel and flooding itself out then its definitely gonna be an electrical problem most electrical problems happen once the bike is warm, thats when they break down, i would try to confirm that its not flooding itself out first...like maybe fire it up and then turn the petcock off and see if you can get it to not stall on you by messing with that, kinda try to regulate the ammount of fuel going in yourself...if no luck then maybe a stator or coil is bad, maybe a sparkplug boot and wire or something.