Originally Posted by 1984_FXRT

W/a DynoJet? And it's jetted such that there's no pinging/carb farts? If so - then you and your machine are a pleasant rarity.

I had a well setup (according to the A/F sniffer in the exhaust pipes) Dynojet in my '98, and pulled it out because I couldn't get more than 40MPG on the highway.

After making numerous dyno pulls, I've found that leaving the slide STOCK (don't drill the transfer port hole out in the bottom, this causes the bike to "hunt" at some part-throttle settings), slightly enrich the mixture screw, use a thinner-tapered needle (like the NOKK from the ealier EVO XLs that didn't have an accelerator pump), increase the size of the primary jet (45 is a good starting point for most stock/mildly modded XLs) will satisfy most bikes' needs.

If you experience pinging at highway-speed rollons, you may need to up the main jet as well.

Glad yours is working better than mine and most that I have personal knowledge of running the DynoJet.

Originally Posted by DOMAPOI

I'm wondering what year your bike is. I have rejeted several 2004 to 2006 CV carbs on Sportsters and the main just has never been as low as 45. That is usually the size of the pilot/slow/idle jet. The MAIN jet has usually been 170 or 175 and I usually up them to a 175 or 180, respectively . Unless what you are calling the PRIMARY jet is actually the pilot/slow/idle jet (I list all three because some people call the jet that controls just the idle one of those three depending on what book/manual/mechanic you go by and the one that controls the fuel when you are twisting the throttle is called the main jet).