[pimpnuts007]

I have a 150cc Carbide Go Kart that i bought off a buddy. This kart idles great, has no stumble or miss to it, but has no torque at all. I can be in a flat feild and it has a hard time pulling out. Now it runs fine on pavement but only has a top speed of around 15-20mph. Ive read on here for awhile and checked a few thing like jet size (34 and 114), air cleaner (uni-filter) , and exaust witch has been gutted and nothing has fixed it. The only thing i can think of that could possibly be the problem is the clutch. Any help would be greatly appriciated. thanks