New Carb/Jetts CRF100

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Nov 13, 2016
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I am relatively new to the dirtbike world and need a little advice on what to put on my sons bike. We just put a FMF Muffler on his stock 2005 Honda CRF100, I am getting some blowback and think I need to rejet the carb, which I need to replace anyways. What suggestions do you have for a new carb/jet sizes and air box if needed.

Thanks in advance