CV Perf. parts installed, still having hiccups at speed.

Wife bought 2005 XL883C: Had factory pipes with baffles removed, we added K & N air filter,. Not sure what jets are currently installed in carb. Assuming they are still the factory set.

Was having problem with the carb hiccuping when riding at highway speed
(55-60) either with steady throttle or letting off slightly. Also, less frequently during acceleration.
Thought a rebuild was in order. I installed new parts including CV perf. EZ- Just mixture screw and packing, CVP Velocity Needle, CVP slide spring and a new vacuum slide. Based on the descriptions of these parts I was sure that the issue would be eliminated.
I adjusted the mixture screw as describe and the low end seems to be good. No hesitation on throttle or backfiring when releasing the throttle. I don't have a tach on this bike so I don't know what the actual idle speed is but when trying to turn the screw in to get the idle to stumble it didn't seem to have any affect.
Still having the hiccups at speed.
Any ideas as to what would be causing my mid to high end coughing problems. I would like to continue to use the factory carb but am considering a change to Super E.

Thank you for the information kenfuzed.

The emulsion tube is stock.
I don't know for sure what the main jet size is but suspect it is also stock.

I have decided to order up a pair of Vance and Heinz slip on mufflers with baffles to get the back pressure back. I will install them and in the mean time get the jet sizes for reference in case more tuning is needed.

Thanks again.

Just wanted to say Welcome from one Minnesotan to another.

I installed the new Vance and Hines slip on mufflers with baffles. While they sound great, we are still experiencing the cough/hiccup while at speed. It is most noticeable if you let off on the throttle a little and then roll back on.
The symptom is not as noticeable if the enricher is pulled out about 1/3.

As I stated in the previous post, the emulsion tube is stock. I checked the jets and they are Idle = 45 and Main = 175.

Kick the main jet up one size.

I have another question referring back to my 1st posting. When I've tried to adjust the mixture screw down to the point that the engine begins to stumble, I don't notice much if any difference as I adjust the screw to the full closed position. From what I've read this indicates that a smaller idle jet should be installed. Is it usual to go with a smaller idle jet while increasing the main jet?

Since the last post, I pulled the emulsion tube and installed the CVP model. Also installed a 180 main jet. The mixture screw is turned out about 2 3/4 turns and i am still having the same problems as from the beginning of these posts.
I tried the propane trick to see if there were any intake leaks but nothing seemed apparent.
Is there anything else I should check? I am at wits end with this thing. I can't figure out why I can't get a good tune, even with all the CV Performance parts installed.
Is there a procedure where I can go back to square one and start over with this process?

Was this a problem before you did any mods at all to the bike ?

If he isn't hammering on the throttle, he is pretty much still on the pilot circuit. I would check to make sure that the pilot jet is clear and free of debris. If it is, then go to the next size pilot. I know it is a different bike and carb but my wifes bike would pop like crazy below 60 mph. Once I got in the upper speeds it was fine. When I would let off of the throttle, I would get a real nasty decel pop. Decel popping is a sign of lean condition. On a CV, with a Sportster, 55-60 is teetering from pilot starting to transition to main, especially on an 883. he could try putting in the N65 needle to see if it is the transition that is causing the problem..

Just thinking out loud.

Yes, over all about the same.

Thank you so much. I was beginning to think I was completely inept at this whole CV tuning thing. I appreciate all of your help. My goal is to have a ride-able bike for the wife so that she doesn't lose interest.

Ken, I often hear you say to avoid drag or short pipes. Just wanted you to know I have drag AND short (34") pipes with 10 1/2" baffles on my 1200cc shovel. Air cleaner is a stock knucklehead (5" dia.) with foam insert.

After installing your tuners kit and a new stock slide, my carb is spot on and the motor runs great. After 700+ miles since the tune up, there's only a very slight yellowish discoloration on the pipes.

Senojbor - I hope your carb problem got solved. Welcome to the forum and I apologize for hijacking your thread!

I need to thank Kenfuzed one more time. I received the new needle today and installed it. After minimal mixture adjustment the bike runs like a dream. I couldn't get it hiccup/cough ect. no matter what I tried. Good Job.

See post 12. I suggested the needle. I must be a mirage.

Thank you to you also Johnny.