I just stumbled across Trinity Racing products and they claim they can modify your CDI box (regarless of make or model) to remove the rev limiter for only $70.00

You just ship them your box and they'll ship it back modified.

Here is the link:

http://www.powersportsmall.com/psp/s...D=164&CATID=25

Or goto

http://www.trinityracing.com/

Click on [Products]
Then click on [4-Stroke Performance]
Finally click on [Black Box upgrade]

-Later