If you have a lot of popping on decel, you either have an exhaust leak, or youre are running slightly lean on the idle jet/Co screw (fuel screw)
On my xt600e, I needed to go up on the idlejet, after fitting oversized headers, laser produro exhaust, and the top of the airbox removed, together with using a pipercross foamfilter.
The stock needleposition and mainjets were fine, actually the stock mainjets was still ever so slightly rich.
The Co/fuel-screw is just that, a fuelscrew. The more you loosens it, the more fuel it will flow, up to around 3 turns out, after that it cant open for more fuel, and you need to go up in the idlejet, turn in the screw, and start to loosen it again. You loosen it untill you have the strongest idle on a warm engine, after that you tighten it 1/4 turn. (rule of thumb)
Hope you can use some of the above.
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