thanks for the replies guys the bulto's totaly standard and origonal by the look of it i bought it from a guy i know in kincardine who bought it he thinks at the end of the eighties and used it for mucking about devilla for a couple of years . he bought it from Ian Shedden , its still got the IRS sticker on the tank !! av replaced the plug cap and carb to airbox rubber plus the air filter and it seems to run fine . Would a 250 top end fit an it ? cheers again