Hi, Have bought a 1981 honda rs250 to renovate and use as I have had to give up riding my heavier bike due to recent ops. On taking bike off centre stand I find that the drive chain rubs across the stand leg even though I have took the slack out of chain and am wondering if sprockets have been changed or part of stand mechanism is missing allowing it to travel up to far when not in use. Do not know what size sprockets should be fitted. Can anyone give any suggestion please to fix problem. Cheers.