I have to agree, I took my carb apart for the second time today and there is no carb restrictor. The only thing you could even try to do to create more power would be to drill out the fuel inlet in to the carb barrel, drill out the flat spots on the bottom of the carb, and try to enlarge the hole in the slider portion of the carb. that way you are moving more fuel and more air at one time. But, that would cause some major tuning issues in the long run.