What would be a good place to make a port and polish and head mod on an 1985 Tri-Z? Most place specializes in the 250R but not in the Tri-Z. Anyone knows of a good place to do this type of work on a YTZ250? And BTW I am not changing my Z for an ATC250R that would NEVER happen. I may add a TRX250R if I could find a nice one.