I have not had much luck either, I have been having Carb Problems too which has kept me from doing any more testing. I think the attached universal one may work but have yet to order it to try it outIm looking for one too. Mine will not rev with it hooked up, but unhook all 3 wires on the speed limiter and it runs great. But I need a kill switch. Had any luck finding an aftermarket speed limiter?