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Not necessarily. Remember he went up from a 98 K to a 100 K main jet. On a stock bike, the 98 K mains are actually pretty rich. Once you add a full exhaust and pull the snorkel, it's pretty much optimal, if not just a touch less rich than it should be (you want to aim for 12.8-13.2 under heavy load)
Since he went up a size, he should be fine.
When I added a full exhaust and opened my intake lid, I went up one size and it felt perfect. Another newgen rider around me took his bike to my shop and had them install a Yoshi full system and remove the snorkel and put in a high flow filter. They went up to a 100 K main. (same size as the OP is using). I'm pretty sure that his main is either right or close enough to be fine, even if he is at sea level. I'm not that much higher than sea level to really make a significant difference.
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