Powdercoat is for small metal accessories or maybe big ones like pegsets and things.
I don't think I've ever heard of anyone powdercoating a tank. Something that large I'd think would require it to be painted so you get a nice smooth even glossy finish on it.
To take tank off.
Remove two bolts under operator seat. 5mm Allen head I think, one on each side.
Remove seat. Remove two screws on steering neck, front of tank. BE CAREFUL NOT TO DROP EITHER THE BOLT OR WASHER WHEN YOU TAKE THEM OUT. (took me an hour to find a washer one time, fell into the void and was gone!)
After taking out two screws up front take out prop rid from inside tail section, lift tank and use prop rod to hold it up. Stick the angled portion of rod in steering stem hole and use the other end with stamped flats on it to go into one of the screw holes on front of tank. With tank propped you now need to unclip fuel lines. Set a towel inside under fuel lines before you disconnect them to soak up little amount of spill. Once lines are disconnected lower tank back down. Go to back of tank. There is a long single screw going thru a bracket. You want to remove the screws holding that bracket not the single bolt. After you do that lift complete tank off.
Im guessing you will still have to remove fuel pump and remaining gas, not sure?
I'm pretty sure you can paint it with pump still in it but if you do powdercoat it you will have to remove fuel pump to protect gaskets from melting in the bake and the gas of course will have to come out to prevent explosion.