A. Reeds are equivalent to valves on a four stroke. They let your air fuel mixture go into the cylinders and also down to the crankshaft and connecting rods, so they can get lubed up since teo strokes don't have crankcase oil.
B. Porting is done to the intake and exhaust port of your cylinders. If you look at a stock cylinder one the intake and exhaust ports they are all roughed up and nasty looking. So they take a dremel tool or something close and smooth out the surfaces and also make the ports biggest for better and smoother flow. this is like one of the highest H.P. gains you can get.
C. Domes are what go inside of your head. They look this little UFOs and those control the size of you combustion chamber and psi. I think stock is 21 or 22 cc domes but once you start modding you shee and can't stop, your gunna get a cool head, and what that does is give you more to for coolant and also allow you to be able to swap your dome and either dorp down some sizes and raise your psi and get more power( but if you are running anything over 150psi you have to start running race gas, and that cost lots of money). You raise your psi but putting in smaller domes like got to 17cc or 19cc domes.
D. T.O.R.S. is Throttle Override something system= pain in your ass. Get rid of them asap, all the do is if you crash and your throttle gets stuck wide open it shuts off your shee. They cause lots of problems for your shee to, so just get rid of them. O and they are those big ass things on the top of your carbs.
E. +2+1 refers to front suspention. The first number is how much wider on each side you a-arms are going to be, and the second is much they are going to foreward to give a longer wheelbase. overall it gives to a better stance and then you get to have some kick ass aftermarket shocks that feel like your floating on air when you ride.
F. Jet kit is comes with new needles and a varity of new jet to tune in your carbs so youe shee will run sweet.
G. Go to the jetting and exhaust forum and look at the top in the pinned section and theres couple and pages and really detailed jetting.
Well that about sums it up so good luck and if you have anymore questions lets us know.
And to all you more knowledgeable guys out there if im wrong or left anything out, please correct me.
Matt