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A dialed in Mikuni on a breathed on HD motor is a wonderful thing! Not much choke needed to warm up and they have clean, smooth transitions from idle to WOT and very good street manners.
For an 06 that does not come with ABS and ABS cant be added to it, I'd take the carb over the FI every time. Easier and simpler to maintain as the bike ages. I like FI alot , but for an older bike that already has a lot less electronics, I'd go with the carb simply because I'm very comfortable in runing them.
Carb will do fine unless you change altitudes then will require a re-jet in extreme changes. I accepted EFI and found it to be better in so many ways, economy, reliability, ease to start as no choke little chance to flood and so on. Processors can be retuned without much fuss, add on electronics to change the curves and not having to deal with a fixed value as in a carb. Others can dispute as they wish, talk to those on the dyno's and see which they see as better.
I've been riding bikes since the 60s and have only owned 4 bikes with EFI. Two of my current bikes have carbs and are still running fine! The problem with Harleys, whether carb or EFI, is if they have been well tuned when modified. So ask for evidence that bike has been sorted by a competent shop. A dyno chart is also worth asking for sight of.
I won't argue that fi gives better results when it's working, and overall is even more dependable. But I'm still carb only, know them, comfortable with them, and like the idea I can do a roadside teardown with them, although it's been decades since I've done that. Don't have to learn new tricks, don't have to buy new tools, and can continue saying my bikes haven't been in a shop while I own them. The headaches I read about on this forum from folks modifying their fuel injected bikes sure don't encourage me to want one, either.
Before someone says, what about cars - those are just transportation tools to me, don't play with them, no mods, and appreciated it when they went electronic and all I have to do is change oil, brake pads and tires in a 100 thousand miles. Bike is way different animal to me.
I'm not even sure they made a carbed Street Glide probably an Electra Glide Standard but whatever.My carbed Suzuki is still running like greased owl sh*t 13 years later.I won't say carbs are easier to tune but they are definitely cheaper.It don't get much simpler than 1 carburetor.IMO EFI is kind of a waste on a Harley they replaced 1 carburetor that damn near anyone can tune with a bunch of electronics that need expensive tuners and sometimes dyno time to get running right.That said once you do get EFI set up you will not likely need to do it again carbs need periodic adjustment but again it's not that difficult.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.