Originally Posted by Team Duratrax
Never touch the sleeve.
I wouldn't go messing with port polishing either. The fuel/air needs to mix around together and if your ports are smooth surfaced then there is less chance of the fuel and air mixing together if you had rougher ports.
So basically, your engine would perform better without the port polish because of the fuel/air mixing together.
Sean
youre half right , The carb mixes the air and fuel before it enters the engine, what rought surfaces do is help break surface tension on the droplets of fuel and allows it to atomise more readily.