Slipping clutch fixed but has revealed a poor mixture set-up, there's a lot of smoke and I am hoping it's a simple oil pump adjustment. My bike is a 1977 DT250MX but the manual I have seems to show a different pump. Does anyone have an idea how to do this?

dont bother until you have a few road miles done michael they will smoke a bit at first but it should clear...make a judgement then but i doubt you are over oiling. By the way havent you got a workshop manual?

I was hoping to take it for it's MOT and thought the tester might have a view on the smoke cloud! I do have a manual, bought from a Yamaha dealer in Wales on eBay, but it is hopeless - paid £18.95 for it too! Going for a bit greenlaning this afternoon, will let you know how it goes...