I put a used motor in that was imported from japan about 4 years ago and the time has come to rebuild it. A buddy of mine told me that the 21RU has all kinds of diffrent little "BUGS" I guess you could say (i.e. berings and seals) than the 22r. I plan on getting a master rebuid kit, and i need to know if anybody can conferm these diffrences that have been mentiod to me and if so what rebuild kit do i need to get? Is there a special kit somwhere specifically for the 21RU? Any and all help would be appreciated. Thank you for your help and knowledge.