I just got my first moped, a 79' Magnum MKII. It runs and that makes me happy. It tops out at about 20mph. I know absolutely nothing about tuning or performance parts. I've read about a million post on polini vs. metrakit. Somebody enlighten me, if I wanted to spend some money, what's the best set-up for my moped? Do I really need to buy anything?Where can I get the best deals if I do? Is this something that I can do myself? Thanks for the help.