Bike is running only on 3 cylinders

[j0nes]

So my bike started to pull badly on low rpm. I had to drive 400 kilometres because I was long away from home. Firstly it sound like its running on 3 but when it takes 6k rpm it sounds normal again. But now i think its running on 3 cylinders all time and cant go above 120 km/h. I have driven only 2k kilometres on my sparkplugs but i tested my old plugs and it works the same way. 1 cylinder exhaust pipe doesnt heat as much as others. When I emptied carburetors there was much less gasoline on 1 carburetor than others. So can a bad carb balance make that one cylinder isn't running or should I take carbs out and try to clean them? It also backfires on exhaust pipe if accelerate full throttle and then let it go.


So what should i try first? TPS, sync carbutetors or take carbs out and clean.