first bike

[screamer]

can anyone help me with my bike int around a 90 rm 125 it boggs b4 band and then first and second gear werks ok in the band then after that the all cut in and out like sputtering in the band?
i put a new plug in still didnt help

 

[Porstala F9]

sounds like it could use some carb work jetting to me.. when was the last time you rebuilt the engine?

 

[Chili]

Start with the carb. Remove it and disassemble and give everything a good soak in carb cleaner. I had similar symptoms on my old RM and I found the main jet was partially clogged when I bought it.