Cv Carb

I rebuilt the carb on my 2003 Sportster, Sport (XL-S). I have a spare part that I couldn't remember where it came from and couldn't find it on any schematic. I think the carb is stock equipment and appears to be a Keihin CV 40mm, but not sure because it only has a Harley Logo. The extra part is about 5/8" long 3 sided solid brass rod. The reason that I rebuilt it other than I've had it for five years without any carb work, is it would run good at first and after cutting off and restarting seemed to only have about half power, like running on one cylinder. It didn't seem to be electrical because running Seafoam through it had good results until recently. Appreciate any and all help.

can you post a pic of it?

Can't get the picture to upload, but it is closer to about 1/2" long and 1/8" or less thick

Finally got it.

That doesn't look to me like anything from inside a CV carb. Are you sure your jets are clear of obstructions and that your float bowl is adjusted correctly?

Looks like the inlet valve without the pointy rubber part that seals against the seat.

Thanks for the response, Put it back together and it idles fine but won't take any gas. It dies as soon as you give it any gas. Pretty sure I got all jets cleaned. Totally disassembled, soaked 2 days in carb cleaner before blowing out all parts. New needle and seat valve, new gaskets and accel diaphram. Accelerator pump, fills bowl and shoots a good spray into the barrel. Adjusted float because it depressed the spring loaded part of needle when carb was tilted at a 17 degree angle and float was parallel to carb, may have went to far the other way bending tab to correct.

http://bike-talk.com/forum/attachment.php?attachmentid=7838&stc=1&d=1369790184
This is the beast.

+1

Nice Sporty, Poorfroggie. I'm still not sure what part that is, and although it does resemble a fuel inlet valve, I don't think that's it. Surely you didn't forget to put the fuel inlet valve in the carb when you rebuilt it LOL.

If your float is adjusted anywhere between 15 and 20 degrees, it should be fine. I picked 17 1/2 degrees because it was the midway point between the two extremes. Bend very, very conservatively. 17 to 18 degrees will get it just right.

But perhaps the float isn't the problem. Jet sizes could be off. Gas cap not venting could cause a similar problem, creating a vacuum and not allowing the gas to flow freely to the carb.

Thanks for the input, not fuel inlet valve, replaced with new one in kit and old one is still intact with rubber point. I have to admit that I guessed at angle but did use calipers for measurement, which I went to the high end at .453". I will pull it off, cut a wedge of wood at 17.5 degrees and go through float adjustment steps again, check gas cap, look for air leaks. I didn't change the jets, not sure if they are stock though, the former owner put an Andrews cam in it and might have needed to increase jet size.But it ran real good for several years with the jets that are in it.

Not quite...HD changed from the 3 sided valve to 4 sided in the early '90s...

Make sure you don't have the needle jet installed upside down...

Here's a link to pics of it installed correctly and incorrectly...

http://bike-talk.com/forum/cv-performance/17202-faq-carburetor-tuning-issues.html

Thanks, pretty sure that's right. flush surface of needle jet matches flush surface on jet holder and concave end helps jet needle line up with hole.

Wuz wondering if you ever got it straight?

Should be back on it today, also in the middle of remodeling 2 bathrooms in an (1937)old house. Good news though, while picking up bathroom fixtures I stopped off at the Harley Shop with my unknown widget and they assured me that it wasn't a part of my carb.
Thanks, Greg

Lucifer, link no longer active, error message, any help on pics/diagrams elsewhere?

LOL...The link was from Bike Talks old version...In the CV carb troubleshooting section I think it was...I saved the pics...will try to post them

kewl, ty, I actually dropped one of these once and tried to run the bike after reassembly w/o it, sheesh, keep on learning, now I've got an 03 with a cough/sputter at just barely over idle throttle while riding (lugging) that I'm tryin' to figure out