Cutting top of airbox
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Mine didn't like too much air I've had to seal Some of the hole back up and I'm running a full dep exhaust carbon reeds and a 250 main jet
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My stock bike runs better with the snorkel removed, and the hole in the airbox enlarged.
I have added a little splash guard to keep the water away from the opening.
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Yes, might be glued in like the airbox halves are glued / screwed together