If you know anyone local with a 270 use their front and mid box for a run, could just be its caked up from poor running gradually from new. If it sorts it, clean yours out and lean the jets, pilot first then main if its still running rich on over half throttle.

Good luck

Good evening Mr Baines, can i say thats a nice photo of you next to your post.

But didn't ya mummy tell you a LADY crosses her legs ya slap#er.

Nice to see you on a bike again see you soon

Thats a great working out thingy you found.

how about crankshaft oil seal, oil getting past the seal from your gearbox, sounds about right for the simptons