Thanks, guys! I ordered the new throttle (don't know what caused the old one to fall apart), once it's in I'll go through the re-torque and then just enjoy it. I'm a firm believer in driving/riding my toys, and this will be no exception.

On the 750's, including the Atlas, and to a lesser extent on the 650SS also, head gaskets were a weak spot. Even my Norton works hack 650SS blew two head gaskets in the 18 months I used it as a ride-to-work. I suspect that the increase in bore after the 600 Domi left too little material round the edge of the gasket. It probably still had the same p/n as the 500!