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backfireing and wont stay idle new pipe and air filter

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i havent messed with the jetting but i have an 06 crf450r and am curious as to what i need to do to fatten the jets up a little....i assume thats my problem but not truely sure. I'm at about 5-600 elevation. the pipe is a factory 4.1 titanium and its just a crappy UNI filter.

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am i gonna need to pull the carb off to fiddle around with the pilot? or should i think about changing it regardless? stepping up to a bigger jet?

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I appreciate the response....when I had the stock pipe on there it would idle fine but I changed the spark plug filter and put the new pipe on and now it doesn't idle.

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