truffle wrote:I'll be interested to find out how you get on. Most people use modern multigrade oils without any problems.
With the 20-20 vision of hind-sight I did notice similar symptoms the first time I got the bike running but being more used to Japanese engines where the clutch does run in engine oil I did not twig there might be a potential problem. I would guess they use different friction material in their clutch plates.
You live and learn .