I've realised that there isnt any fuel getting to the left carb. Found that out when i was swapping carbs over, no fuel in left carb. Think there could be a blockage somewhere, before that was smoke when I was applying some throttle, but today and yesterday there was no smoke to the left side, just a tiny bit of air going at the same rate as the right exhaust. Also swapped over spark plugs, still no change.