Thanks for the advice guys, when it's running the oil does seem to be well down the sight glass - I think it was just some bubbles of oil against the glass. The oil is definitely clear when stopped so I don't think it's a problem - I'll just keep an eye on things for a while until the paranoia subsides.
Once again thanks for the words of wisdom - like I said before this is my first bike so no doubts I'll be asking more silly questions and calling on all the excellent advise/experience on this site.
