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I just went through this last week. I just put a 2" snorkle on my 500. Mine did the same thing. I covered half of the intake and that made an improvement. After taking it for the first real ride, I found that the bike was running lean. I installed a 165 jet, and turned the idel/air screw all the way in, and then back out 2 1/2 turns. Then put 1 #6 washer under the needle, and cut about an 1" off of the spring. This seems to be working great, and I am finding a decent bit more power.

And I have the snorkle open all the way, I did not need to resrtict it.
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