CAN YOU HELP. I HAVE RECENTLY PURCHASED A LIMITED PRODUCTION BSA REGAL SR 500, POWERED BY THE YAMAHA SR PLANT. I INTEND TO CARRY OUT OWN MAINTAINANCE, BUT WOULD LIKE TO KNOW ANY CHANGES MADE AT FACTORY LEVEL TO THE ENGINES. THIS WOULD HELP LOCATE THE PROPER WORKSHOP MAUNUAL. THE ENGINE FITTED TO MY MACHINE IS A 2001 FACTORY UNIT WITH ONLY 170 MILES RECORDED. WILL AN OLD WORKSHOP MANUAL BE OF USE, OR HAVE THE INTENALS BEEN CHANGED OVER THE YEARS. ANY HELP IS GRATEFULLY APPRECIATED.......EWAN HILL....SCOTLAND