Question about 2005 Harley Davidson FLHTCUI Electra Glide Ultra Classic

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2006 FLHTPI 1440 38.000 MILES BOUGHT 3-1-2010 FROM HARLEY DEALER... BUCK SPITS AT 25 45 MILES HR SO FAR THEY DONE DOWN LOAD,NEW ECM AND NOW THEY SAY IT NEEDS UPPER END!!!! WHATS UP DO THEY KNOW WHATS UP OR NOT HELP

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Well, I don't know a lot about the electronics on your harley but it sounds to me like either a fuel problem or an exhaust restriction problem.

I had a bike that would not run over 60 miles per hour once. I did everything including a complete top end overhaul. Still would not run over 60 mph, would start spitting back out of the carb. Turned out to a pair of baffles stuffed way up inside the pipe.

I would not think that at 38K, you'd need a top end overhaul. Unless the bike has been severly abused, you shouldn't be thinking of a top end job until 50K at least. Have they done a compression test on the bike. That will tell the story as to whether or not you need a top end job. Still I would not expect a poor top end to cause a problem in a specific speed range. If the top end is in poor shape, it effects the entire RPM range.

I'd suspect a mid range lean condition caused by the electronic fuel control. Take the bike to a shop that has a dynometer and an exhaust gas analyzer. Have them run the bike up and watch the fuel mixture throughout the RPM range. It shoud be between 13.8 or 14.0 all the way though the range as best as I can remember. Now, I'm not an expert on all this but I have seen it done a time or two. The 13.8 mixture is slightly rich, but it will help the engine run cooler and be more driveable. The EPA doesn't like it but so what. I do know that the bikes come set to run very lean from the factory.

Like I said before, I'm an "old school biker" and I work mostly on Evo's and earlier bikes as I don't know much about the computerized controls of todays bikes. So, take what I've said here with a grain of salt. But, I hope it helps.

Good Luck
Steve

Posted on Jun 04, 2010

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