Stubborn bead

I'm replacing my rear dry rotted tire on my 80kz550 and I can't get the bead to seat all the way. The tire I put on is tubeless and there is a tube inside of it but I can't get the bead to seat about 10" around the rim. I'm leaving it out in the sun today to see if that will help at all warming the tire up. It is holding air, would it help if i ride on it?

I wouldnt want to ride on it.
More air to force it out ( within reason )
Reclean wheel and add soap and try again

I let it sit in the sun all day on my grill, it seemed to bead up while i was at work.

Dont know how you mounted tire, but I always clean rim good, remove valve core and inflate the tire until I hear the bead pop, which is usually around 10 to 15 lbs over the amount of air the tire requires.

I actually took it to a shop and they handed it back to me that way. I broke the bead and lubed it and filled it up with air over the max pressure and left it in the sun. The shop popped 2 tubes trying to get it to seat and gave up.