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my Hellcat has the following mods:
- VM22 knockoff kit from eBay
- Aluminum intake that was included with carb (larger diameter than stock)
- enlarged opening in paper carb gasket so it is no longer a restriction
- drilled out welding inside header pipe so it wasn't such a large obstruction (used a step drill)
- oiled foam filer (not the K&N-style pleated cotton one included with the carb)
- no airbox, carb pointed forward
With that setup, it kept running lean even with a #125 jet! It was surging and the plug tip was whitish. Since I only had jets up to #125 and I didn't want to wait for the new ones to get here, I took the stock jet and drilled it out until it was slightly bigger than the #125. I actually put the jet in my drill chuck and the tiny drill bit in a vise.
I'm not sure exactly how big the hole was when I was done, since the bit was a 1mm I think. The drill bit had a little more wiggle room in this jet than in the #125. After that it ran pretty good, so I left it in. My bigger jets came in the mail, but I haven't had time to try them yet
I left the needle and pilot jet alone. I think I set the pilot screw at 1.5 turns out
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