I didn't think of leaking crank seals. Jeees, I hope it's not that as I don't fancy striping the whole engine and getting a new crank. How do you do a pressure test on each section of the crank cases? Is this the same as doing a pressure test on the cylinder through the spark plug entrance?
Both cylinders are firing at idle although the cold one seems to stutter a bit and doesn't have the same powerful pulse as the front cylinder.
Fovu, you're a lucky man it's only a blocked jet. I know the jets are not a problem on my bike as the carbs were stripped and all jets were all cleaned. All else seems to be good aswell so it looks like it could be a crank seal leak.
How did you do the pressure check?