Hi all. I have a couple of XBRs. One I´ve owned since around 2001 and a currently getting back into full running order. The other one is a race bike built in the late 1980s and successfully raced in club races where it won a couple of championships. It´s been standing in a shed for the last 20 odd years and I´m hoping to get it rebuilt and back on the track. My first query is regarding the race bike. Does anyone know if I can get 520 size gearbox sprockets for it. The standard size is 525. There are sprockets listed for the similar year Honda XL and XR 600s but these are slightly different. Any suggestions please?