Honda CR 125 bogging when starting out in 1st gear?

I have a 2003 CR 125 that I just bought. Bike runs meticulously but when starting from a stopped position in first gear it bogs down and almost stalls before picking up decently in mid range. Every gear thereafter hits RPM's very well. I changed spark plug and is somewhat better but not much. I don't know if maybe re-jetting the bike is whats needed but the power band in every single gear seems to rip just perfectly mid-high end. Its only very low end first gear that I'm experincing the problem.

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