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After mods bike bogs?

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The other night I did a few mods to my sons crf 70. I removed insert from exhaust and opened air box, after doing these when the bike is running and I crack the throttle it bogs, I am thinking it is probably needing a bigger main jet now that it is getting more air? Am I on the right track with this thought, also I have been having problems finding any bigger jets for his bike it comes stock with a 62 main and I was thinking of going to a 65 main? Any thoughts or direction would be great!

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