Carbs or something else, maybe?

[greenman]

I had same symptoms, tryed every thing as it felt like fuel issues. Carb rubbers were perished, replaced them. Carbs filthy, cleaned them. Filter clogged, replaced it. Plugs, replaced. Nothing made any difference. Replaced plug caps, bike's run like a dream now. On the up side,a lot of hard work but the best service my bike has ever had. So for 20 quid, worth replacing anyway.