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RM125 concern

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My dirt bike seems to have a problem going through the RPMs. So here is what will happen. I'm going good and it hits the powerband for a little then it just starts to not have as much power as I think it should. It only happens at high RPMs and it does it in all gears.anyone have any ideas.

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No it's not the valve. I had just done that. I know the valve is ok so I have no clue what else could do this.

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Do you know what your main jet size is? Sounds to me like your running way too rich (too much fuel to air) Try leaning it out and maybe raising the needle clip position

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If I remember right, on my old 125 (that was jetted perfectly) I went back and forth from a 180 main jet and a 178 along with my needle in the 3rd clip from the bottom.

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Ok. Well I would buy a 180 and 178 main jet, try them out and see if it helps. Your carb could be dirty too.

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Ok so I should do a carb clean and new jets. Is there anything I can put in the gas that will clean the carb on a 2 stroke?

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No there is not. Try new jets first, and if that doesn't fix it then clean the carb. It's a bitch to get the carb in and out

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i'm from MA as well and my 125 didn't run good with the 175 main jet. i put in a 170 and moved the needle to the 3rd clip, and its a night and day difference.

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i'm from MA as well and my 125 didn't run good with the 175 main jet. i put in a 170 and moved the needle to the 3rd clip, and its a night and day difference.

Do exactly what he said

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are you sure your powervalve govenor is working right? i had about the same problem where it woul say load up and it was mypowervalvegear being stuck.

or it's your coil failing under load like mine did.

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