Is this on the '98 listed in your profile?

Not planning to do much more your cheapest and nearly the best route to take might be the PC-III with a tune at a center with their dyno-link (or whatever it's called) setup. It'll pretty much automatically set the fueling requirements in the PC. Timing changes would still be up to the technician. The SERT would allow you finer-grained control, along with greater range on the spark timing, but it'll cost a bit more and the technician's abilities are more important with it.

 

While I have added cams yet, I plan on the thundermax with autotune when I do. Mostly because it will work if I make further mods to the engine. There are many many posts and its almost a relegious argument. You can check them out.

The SERT is a one bike shot, that is I am told that it will work only on a single bike. (I hope I get flamed for being wrong )

Expensive. I beleive scooter64 has a good price. But I like the idea of not having to dyno ever.
...gene

 

Check out techlusion adjusts like carb,no dyno needed