Postman Rog

Helloooooooo, its me Postie Rog. After tooo many years on all fours, thought I would go on two wheels before I degrade to going on all Fours, or worse. So bought a basket case Yamaha SR 125 for starters, but need help !!!!! The bike has cleaned up quite well but, I need a workshop manual to help me replace the Headstock bearings, which failed the MOT. It need's tyres any links would be appreciated. Any information would be gratefully received. Many thanks Roger