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Jetting set up

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Sorry for a thousand posts, but im confused on which way to go with the carb:bonk:

Its an 09 yz250f, my elevation is sea level.

The temp it will be riding in is mid 60s to high 80's maybe low 90's

Whats installed:

Aftermarket air filter (forget the name at this moment)

Full Yoshimura Rs-2 Comp series exhaust


-From 0 to quarter throttle, i get a very bad hesitation in the bike, even close to half throttle

-Back firing on decel

-The infamous bog issue as well.

Now my questions are:

Im going with the JD jet kit, but there are no pilot jets that come with that kit, Which pilot jet should i get?

Any ideas on the Main jet?

Thanks again guys

Really Appreciate it.

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