Ported how? If you mean the exhaust window in the cylinder wall, then it is probably on track to where it needs to be. If they machined the EXIT of the exhaust port, they screwed the cylinder and killed a bit of power.

The proper way is to open the outer/upper edges of the exhaust port, so the roof of the port is more flat or straight across. The NSR suffers from too little blow-down exhaust port timing and this fixes it.

It is pretty easy to port these if you are handy with a dremel. You have to be real careful not to cause the plating to peel, and round/taper the edges of the plating to keep the rings from catching.
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Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
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