When i gunn it at around 10-15kmh it bogs for a few seconds ( throttle pinned ) then she will start screaming.. Im temporarily running an 89L belt and I'm wondering if its belt or carbs or something else..
Have you checked your belt deflection? If the belt is too loose, it will allow the primary clutch to up-shift faster then the secondary clutch causing a low end bog and poor performance.
Yep, carbs need to be clean. I don't even think about starting mine till I've cleaned them, and nothing but fresh 93 in the tank. Do they know what they're raising the needles too?