My friend has an '85 that gets really boiling hot when it runs. He has checked the water pump and it works, the radiator is not clogged, the thermostat opens when boiled in a pan of water, and the thermostat fan switch was replaced and it turns the fan on when it gets warm. He can't seem to figure out why the water gets so hot and the bike overheats. He thinks maybe the head water passages may be clogged? He also wondered if anyone knew if the head off of aventure Royale is the same as a VMax head? Any help on this problem would be appreciated.