Backfire at wot

[ventostu]

I have a 70cc kymco super 9. Mj95 stock carb and air box, exhaust.

So my problem is it idles fine and runs good up to wot. Then it spits and backfires through the exhaust. Pls help

[inuyasha]

Hi
Sounds like its running lean try upjetting.
Take care and ride safely
Yours Hank