Thanks for that info I have checked the con rod and it is still round and no bad scoring just a few minor scratches no sign of any heat problems, have ordered a new standard bush did not realise you could get oversize ones and will see if it is a tight enough fit if not I have a small lathe and will turn a bush to suit, I am by no means an expert on lathe turning but will have a go and if it does not work out I will order an oversize bush. Looking at the bush that turned it would appear that sometime in the past a previous owner has fitted a bush that was maybe a little to small and has tried to compensate by putting a series of pop marks all over the bush to make it a tighter fit, I have had the bike for about 3 years now so it did work for a while.