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I would like to know if the vest keeps jackets from venting too? I usually get pretty warm already.

Thanks, thats good info! I just changed out my plugs from an ecs-5 to the ecs as well (larger gap), so I'll do one thing at a time to dial everything in. We're probably close on jetting since my altitudes aren't nearly as high, but I'll probably take it out and run some plug testing then modify...

The 500 is the next size down for mains from 540, what are you using for needle shims? What elevation do you ride at,air temps, fuel types? All those factor in to the equation. What did u notice for richness and jetting when you went with the upper vent vs the lower? The whole idea of me...

I'm thinking of Modding my lower or upper airbox but still deciding. I bought the sled used with 540 jets and. 030 shims and its running rich, so I want to add some air to lean out a bit. I also have an slp pipe, can and head. I'm not sure how the air sensor will be affected from using an upper...