i have a sherco albert cabestany 06,the last time i was trialing on it,it stalled about riding it for about 30 mins,couldnt get it to go again at teh trial,came home with it cleaned out the carb gave it a service,yesterday whilst out trialing on it after 20 mins of the bike running it went off,changed the plug after the second kick it started again,it ran for about 15 mins then it stalled again,couldnt get it to kick over still after about 15 kicks still wouldnt,so i bumped it and it went,switched the bike off while waiting then it wouldnt go again,put a new plug in it went again then after about 20 mins then stalled again,came home with teh bike started after about 11 kicks ran for about 10 mins switched it off,then wont start again please has any 1 have any ideas what this can b it has me mad,,,,,,,left to rottt