what is the stock airbox hole size?

what is the stock size of the hole in the airbox? the previous owner of my bike hacked up the hole size and i'm pretty sure he didn't rejet it. i want to return in to original size via duct tape until i get a jd kit. i've searched and no one seems to state the original size.

If I remember right when did the 3x3 had to add 2'' so 1x1 would be close to stock

I was going to say somewhere in the neighborhood of 1x2 would be pretty close.

Thanks. Hopefully it will run a little better now until I get her jetted.

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