No problem, Like EPR said, I talk too much anyway, might as well try to be helpful.
Piston port, basically the piston opens and closes both the intake and exhaust ports in the cylinder, and that's it, if the piston cannot close the valve in time, the magic is lost!
There is also no real way of developing PSI in the crankcase under the cylinder, which on a Reed'ed or timed port (4-stroke) engine is a nifty way of making pressure below, and then "Shooting" the next round of fuel mix up to the cylinder to be "Exploded" !!
So, while piston port is cheaper, and sort of easier, it's not optimum at all.
Reeds, they sit behind the carburetor between it and the engine, the point of the reeds is simple, a simple one way "Reed" valve, air (air plus fuel) can enter through the intake but cannot exit, this lets the crank case pressure build up, and basically "Turbo's" the fuel up to the cylinder head to power the next "Power Stroke" (ignition of fuel)
Good Job Nick. Don't waste your money on a reed system, for $130 I could have a an HP exhaust a WT 813 Walbro w/ alum manifold w/ boost port, V-stack and choke and air filter, drill holes in the clutch shoes, cut down the fins on the flywheel and maybe add a rocket key if you like.
That will give you more power than them reed kits.