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2001 yz 125 bogging problem

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so i have a 2001 yz 125 that was running good until it started bogging really bad. before all of this i rebuilt and jetted the carb, new cylinder and head, new top end. once i noticed it a little bit later i took out the carb and cleaned it out to make sure nothing got into the jets. it was fine but no diffrence. any ideas?

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You didn't jet the carb richer did you ?  A re-build motor typically runs richer.  May not be your problem, but it's worth a go.

 

For reference, I've got a 1997 YZ125 (which I think is basically the same thing). 

1 size leaner main jet, lowered the needle 1 clip, 1 size leaner pilot jet, air screw 1 1/2 turns out.  Bike funs flawless !

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2001 was the first year of the bigger size carb I believe 52mm. Stock jetting was off on mine I had to play with my jets til it was just right

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