I just removed the tube on top of the air box that attaches to the inlet on the cover. Covered the vent (on the cover) and it did decrease the noise. I have been messing with the carb lately and need a good place to buy some jets. Where is the best place to get um? These things are for sure lean from the factory. I don't have an AFM, but after adjusting the a/f screw, I can smell the richness in the exhaust now at idle. Also starts a ton better.