I had a problem with my 1957 ES2. The clutch was running out of adjustment because when pulling in the clutch lever, it became solid before reaching the handlebar. If I pulled any harder, it felt like I was going to break the cable. At the other end of adjustment, there was little free play. On removing the chaincase, it seems that the nut holding the basket to the shaft had come loose. On firing up the bike, I noticed the magneto was floppy. That needed specialist work. All good now. Cheers folks.