..if it has a drive boss restriction, y' gotta get rid of it..
..reckon some pics , descriptions etc of the cdi and wiring into it would help too...
..i believe there is a air intake limiter, in the oem airbox, where the tubing leads toward your carburetor...
..some have it, some don't...
..above all that, there are some mods you can do to make that a really decent running scoot!!
..Welcome to th' Forim!!
peace