need some help please!

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May 8, 2021
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i am a single mum to 3 boys and hoping that someone on here may be able to help me!!
we have purchased a new slam 2020 125xl bike which the boys love but it does not run great and i have been told by a semi mechanical friend that it is because it is over fuelling on lower revs... it black smokes and misfires low down... i have been advised that i need to change possibly the carburetor but i have no idea what i need to change it to or if it will help??...... does anyone have knowledge or suggestions please !?... all help greatly received

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