Believe it or not,I`ve got a Yamaha DTR 125 front end on my 800 g/s,and it is fine. The forks are 41mm,so a fair increase over the originals. By machining 2mm off the bottom bearing area of the stem,I could fit a standard g/s lower bearing,and a visit to a bearing supplier produced a bearing to fit the g/s headstock and the top of the stem. Voila ! I also fitted Africa Twin fitment progressive fork springs with 22mm long spacers,and 10 weight fork oil. The brake ain`t very good on the road,so it`s lucky dip in the breakers wiv yer vernier.