Tom Angell

I'm giving up on finding a problem with the carburetors or clutches; I've swapped them back and forth between several different sleds. Regardless of how good the carbs or clutches run on my other sleds, invariably this problem sled will perform the same; it will come off the line great, immediatly run to about 6800 rpm's, but within 2 seconds it will bog back to 6500 rpm's and absolutely will not climb any higher! I've tried heavy springs, enclosed and open Comet clutches, and numerous different jet combinations and settings.
It must be something electrical; does anyone out there recognize the problem? Can you give me some advice on what to do?