I have a phazer 2 with a pipe and i have a problem with it bogging down after about 55 mph. The slead has all the tourq in the world until it hits about 55 and dies and bogs down almost like a fouled plug. Once you let off it and the rpms goes down it has all kinds of tourq again till it hits about 55. Does anyone know what this problem is could it have something with my clutch or carbs. Oh yea if you lift it off the groung and gas it the thing will hit 90 until you set the track back on the dround. Any help woild be great

More important is, at what rpm's does the sled start to bog down?

did you re jet the carbs when you put the pipe on? you may be running lean.

Sounds like maybe your main jets are clogged in your carbs. when is the last time the carbs were off and cleaned out?
Phazerowner