does any one no the model number for the dellorto carb to fit the beta rev 3 , this mikuni carb whats on my rev 3 270 2000 , is leaking fuel , bike allways stalls when goin down hills , im from uk living in thailand going to visit my familly next week so ill be picking a few bits up , a new carb will be top of the list of many things , any help please....!