thanx for reply botters
i had considered the dreaded DMF but when its going it goes welland gear changes are smooth and all that.
and getting the the belt on and off is a complete nightmare never come across such a shit design before.
i did forget to mention tho that a tiniest spray of dubD 40 and all is well and smooth and the belt stops flappping (clattering remains)until iv done a mile or so.somthing very not right ere.