generally a carb issue wont restrict top end speed. However, carbs will effect take off. I would recommend pulling the carbs off and giving them a good clean out (fuel pumps on each carb) to eliminate this take off potential problem. Its good to do the carbs anyway to see what condition theyre in. When you are pulling the carbs off, you will have to pull the echaust off which means you can physically look inside the rear exhaust and check that the cat/convertor is still intact. If not, replace with d plate and sensor cut off. Parts of the cat/con can get caught in the exhaust causing performance problems. Also, check the condition of your impeller for any dents etc and the liner gap should be under 1mm. All these things would pretty much ensure you have checked eveything.
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