I'm looking for advise on my '03 FLHT, I have the factory CV carb, 1550 big bore kit, SE251 cams, SE high compression 10.25:1 pistons, SE 31775-01A 6200 rpm ignition,SE high performance air kit, Dyna jet kit, I'm running stock 190 main and 45 slow jets, and my air mixture is at 3 turns. It's been a few years but as far as I remember the needle E-clip is at groove #4 as recommended,and slip on drags.It runs like a raped ape in cool weather, gets sluggish above 80 degrees, and is only getting 30mpg. To me this means I'm too rich. What can I do to get my best performance and up my mpg's to where they should be without tearing the carb off and trying a bunch of different jet sizes? All advice welcome, Thanks

 

Get it up on a dyno.
Scott

 

I agree with Scott. Putting it on a dyno with a good operator is the only way. Anything else is just guess work. dsv

 

We don't have a dyno anywhere around here. I'm not really concerned about the mileage, I didn't build it for mileage, I built it for performance but I would think it should get better than 30. It runs good, and I guess being rich is better than lean