I roll on Works Dual Rates with Remote Ress. I am happy with them.
To get a port job you have to send the jugs (cylinders, or barrles what ever you call them). The opean up the ports. You have to do this very carfully. They chage the port timings. Make the intake, transfer ports, and exhaust ports opean up at different times. There are all different types of port jobs.
MX port = getting the most bottom end.
Trail = all around port job
Dune Port = Mid range to top end power, Most comon port job. If you want bottom end get a 4 stroke
Drag Port = Max top end at the expence of some midrange.
Portjob on a 2 stroke = Changing a camshaft on a 4 Stroke.
It isnt something you can just take a grinder and do your self.
Here is a pic of my stock stroke ported cylinders.
Here is my +4 mill stroker crank drag ported cylinders. They start off by lowering the ports down because when you add 4mm to the stroke of the engine the piston goes down 2mm farther in the cylinder and it goes up 2mm farther. That is why the ports are lowered on these cylinders.
Here is some stock non ported cylinders