performance mods for a stock x7

looking for some performance mods for a stock 49cc x7. thinking about a rocket key, but read it could screw up your motor??? whats a good carb to put on it?

walbro carb(w/ air filter), boost bottle, new exhaust w/ a nice expansion chamber, diff gear ratio(not sure what ratio), big bore kit, reed cage, ngk spark plug

Is your X7 a piston port motor or reed port?? (I thought all x7s where piston port) Mine is a piston port and so far I've added a fatty pipe, rocket key, v-stack, air filter, boost tube, ported metal intake (15.8mm) and an e3 spark plug and I leaned the stock carb and now with my 210lb butt on it the bike will max the speedo plus some. i guess some where in the 35mph area. The rocket key gave the least noticeable diff.

it's a piston port. i ordered a rocket key. walbro carb? thought i heard they weren't any good? sprockets-going with 14t in front and 54t in rear.

R you asking if I have a walbro carb? If so the answer is yes. Had real good luck with this set up until a few days ago. Then it fouled the spark plug and I replaced it and the intake now it wont start without starting fluid....