I'm a carb nut from back in my drag racing days and truthfully even playing with the pilot jets a few up and down didn't see any gain or diminish in performance. I'm sure if I had Travis's gy6 dyno and time to fine tune their might be something but with just the butt dyno nothing I can see. I just like the idea of having it if I need it.
The mains I do check my tune often and have had to change as it warms and cools (buggy gets hard to start is a good key). I also knew I was gonna pretty crazy with the mods on a 150 to a blueprinted 180 so I got the whole kit. Nothing else I think everybody needs at least 2 over and 2 under of the jet size they use most often. Of course that means you need to know what size you need to start with.
If nothing else get a good set of the main jets.
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