Ok, I traded my banshee for an 07 450er (electric Start)

I am located in southern Illinois.

The bike came from west virginia

I have no clue what jets are in it right now, but i believe that I am lean.

whenever i go to like 4th or higher and let out on the gas it pops quite a bit.

I am wanting to know what a good size jet to change and which jet I need to change. I probably just need to change the main jet right?

Heres the performance mods, which isn't too many

No airbox lid
Trinity Stage 4 Slip-On exhaust
Uni Air Filter

I believe thats it. He had it jetted for west virginia, so I figured all of the jets would stay the same except the main, but please correct me if I am wrong.

Help appreciated

Its not your main jet

1) Low end performance
A) A lean condition is typified by surging and popping back thru the carb when steady light throttle is applied. It will cause popping during high rpm deceleration thru the exhaust (quicker when moderately lean, rapid when very lean, once every now and then when correct), once the rpm has dropped enough that the air speed thru the idle circuit is slow enough for it to pick fuel up that is. It can be quickly diagnosed by adding a slight application of the choke or starter enricher (if the popping stops, it’s lean). The intake will have a “droning” sound at steady throttle or under light acceleration loads in low gears when it is too lean. So, the question is; “Does it pop out the exhaust during deceleration with a closed throttle from high rpm to idle, while in 4th gear or above?”
B) A rich condition can also cause surging but will more than likely be very sluggish to respond to throttle inputs too. A quick diagnosis is to run the machine up to high rpm and listen for the occasional (once every now and then) pop out the exhaust, if no popping is heard, it is too rich on the idle circuit or fuel screw. If turning the fuel screw in does not remedy the richness, take a step down on the pilot jet and try again. So, the question is; “Does it pop out the exhaust during deceleration with a closed throttle from high rpm to idle, while in 4th gear or above?” (Ticeman)