I have always had probs with the carb on mine.When i broke down the other day, the Audi man who towed me back home said i could get a heated bi-metallic strip, which would cure the problems! I was then in the local VW garage, and they said to force the flap to stay in the hot air direction, using a screw. I did this, and it appears to have sorted the carb icing!! I'm very pleased...
If you dont fancy altering the air box bit, then get some elephant hose, and route the cold air intake round to sit next to the hot air intake, on the exhaust manifold, this should make it run much better, as the air wil be a touch warmer!
Let me know if they work.
