Nice choice of bike, I picked up a 90 katana 750 this spring, put on 7000 miles this season and havent had a problem with it. I dont know much about the problem you described, if it isnt overheating, I'm not sure why it would be shutting off, some more information might help. Does the bike overheat, then shut off? Is it just when it warms up to normal operating temperature? Does it start right back up? Theres a site online that is specifically for the katanas http:// katriders .com/vb/ , and you might be able to get some info there, or try picking up a clymers manual for the bike.