porting only refers to opening the hples (ports) inside the cylinder. It does nothing to change the bore size. I don't have the book on my new system yet, but I would suggest reading some of the posts on scooter invasion. They take a lot of photos, and post alot of detail on porting all sorts of jugs. The 2 1/2 hours was to clean up any jaged edges/chamfer the ports so they can't catch a ring /and make the cyl base match the crank case. It is all easy work if you know what needs to be done. I don't think I added any real speed to the scoot, but may have added 1-2 Hp, and definitely made it more reliable. Most of sidthesloth's thread is about getting the ports to line up w/ the piston stroke. In Fl. you have to have a valid Dl., and register for six month spans. If you want to ride w/out a helmet you also need personal injury insurance. The Only difference is you don't need a Motorcycle endorsement for 49cc, and under. I also took off the rack, and found some Chrome caps at Ace Hardware that fit into the mounting holes in the plastics.
