2008 CRF250R jetting question

I own 2008 CRF250R, just added a K&N air filter. Have read that it is a good idea to re-jet carb. Have noticed that bike is harder to start since installing filter. I live in South Florida, sea level, 90-100F, 90 - 100% humidity (summer). Bike is ALL stock (except for K&N filter).

What jetting/carb changes should I make if any.


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