So I went back to the carburettor and, with the help of that video in the thread you referred to, this jet appears to be blocked. I don't have the right jet drill or whatever they're called so I tried some very thin stripped tie-wire and it seems to be well blocked. I also tried a pin and same result. I wonder what size it is?
I'm glad I found out where the PCV valve lives as that will help with future repairs.[Linked Image]

The blockage is at the small hole in the end. It's not visible in the photo.

Last edited by sparker; 11/04/15 02:08 AM.