CV Carb - Recommissioning Issues

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Today | 04:45 AM

Ghostbatgoth

Thread Starter

Stage II

Joined: May 2026

Posts: 2

Likes: 0

CV Carb - Recommissioning Issues

Hi,
New here, so forgive any wrinkles in my post

.....
I'm recommissioning my 1994 FXDL and have been working through some issues. It was last run in 2011 just before the family grew by +1. It's now time to get back to business. We changed the brake fluids, they were pretty gunky and brown....
The main issue however has been the CV carburettor. Firstly it was pissing fuel everywhere. Turned out to be the accelerator pump diaphragm, that's been replaced and the non return valve on the accelerator jet was seized, that's sorted. Also the main jet was checked and the slide seemed OK etc. So then plenty of oil in the bores and crank it over. All OK. Next put in the plugs and start up. Clouds of smoke from the oil, that cleared and the engine ran fine.....
But.... after a bit of warm up the engine refuses to run when the choke is put in more than half way. Hmmm???
Any suggestions on the 'next layer of the onion' where to check next.
Kindest regards,
Kara.

Today | 05:27 AM

eighteight

Seasoned HDF Member

Joined: Oct 2019

Posts: 10,790

Likes: 7,414

From: OH

Time to COMPLETELY clean that carb
Jets / passages / emulsion tube
Ensure there are no intake leaks
Carb to manifold ( p/n 27002-89)
Manifold to cylinders (p/n 26995-86B )

Last edited by eighteight; Today at 05:39 AM.

Today | 06:36 AM

CoolBreeze3646

Seasoned HDF Member

Joined: Aug 2006

Posts: 24,492

Likes: 30,780

From: Pennsylvania

Carb rebuild time. Your idle and transfer ports are gummed up or clogged. Go here for parts: https://cv-performance.com/carburetor-parts

Images are from a Sportster CV40 carb but they are the same as yours.

Today | 06:58 AM

Bubba Zanetti

Seasoned HDF Member

Joined: Nov 2006

Posts: 21,047

Likes: 19,174

From: The Wasteland

Good timing for this thread, I just got my CV rebuild kit in the mailbox yesterday. I'll be watching this for some pointers when I tear into mine.

Today | 07:52 AM

Yankee Dog

Grand HDF Member

Joined: Apr 2007

Posts: 3,725

Likes: 3,070

From: Brighton, MI

As previously noted along with the emulsion tube has lots of tiny holes, along with the slow jet, the smaller they are the easier they clog up.

Also, common error when rebuilding carb, see pic below.