The Tyga kit is very expensive for someone here in south africa. My problem is my barrels. No one can do a proper plating job in this country so I tried out the sleeves. First time out the one sleeve droped about 0.25mm in the barrel and blew the gasket. My problem now is all my ports are to big because I didn't do it myself so I need new ones. It would be best to keep the bike 250cc but were would I get barrels that hasn't seen a grinder?