Kx 125 running problems HELP!

I have a 1990 kx 125 I had the top end completely rebuilt but recently it has been running bad I can't kick start it anymore have to bump start it I've replaced the left and right crank seals cleaned out the carb made Shure the floats were at the right height it's dripping spooge all over my swing arm I replaced my exhaust when I start it it idles fine but when I rev it to about half way it goes wooom boooom like its bogging out I'm lost and its now become a headache I've also done all the air ratio stuff and checked the reeds any ideas

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