10 replies to this topic

[Designer]

Hi All,

I have an intermittent problem in that when using the choke and pushing it back in the jet does not go all the way back up. It stops about half an inch down from where it should be.

It is not catching on anything in that area of the engine bay.

Any ideas on what could be causing this would be welcomed.

 

 

[PoolGuy]

Frayed cable?

[Designer]

Sorry should have said a relatively new cable so no problem there.

[sonscar]

The little bent wire linkage is worn and may benefit from subtle massaging.Steve..

[Spider]

This was the factory's recommended fix;-

 

 

Something I need to do on my own car in fact.

[Designer]

Hi Sonscar,

Thank you for your reply.

I will have a good look at that linkage and see if it needs attention.

 

 

Hi Spider,

Thank you for your reply.

The outer sleeve of the cable is retained in its place at the top of the Abutment Plate for HS4 Carb by the clip Minispares part no 13H3472, so cannot slide out of the cable stop position.

[Spider]

The other cause I found these jam, is some of the after market Jets have too short a hose on them. When the Choke is pulled on and the Jet is at full extension, the hose being just that wee bit short pulls the Jet over and jams them in the full extension position.

[Designer]

The other cause I found these jam, is some of the after market Jets have too short a hose on them. When the Choke is pulled on and the Jet is at full extension, the hose being just that wee bit short pulls the Jet over and jams them in the full extension position.

 

That is very interesting that is exactly what is happening. A few years back I had the carb refurbished by a local garage. They did not replace the two springs but recently I noticed they were looking a bit worn so decide to replace them myself. The image below shows what the bottom of the jet looked like before on the left and afterwards on the right. I have only had this problem since I renewed the springs and I also had a very rich mixture. I can only assume that the garage did it this way (on the left) to allow for a shorter hose on I assume an after market jet. By me putting the linkage in the correct position I altered the mixture without realising it and caused the sideways intermittent jamming in the process. 

The car goes for its MOT on Tuesday so as it is now running I will leave well alone and sort it out when hopefully she passes. I have weakened the mixture but have told the garage they will need to adjust it in order to pass the MOT.

 

Edited by Designer, 08 April 2023 - 07:39 AM.

[Designer]

Sorry proper picture

[sonscar]

There is a spring clip missing.Steve..

[Designer]

Hi Steve

 

The clip that holds the ball end of the linkage onto the jet. Yes I know I did not want to complicate my attempts at drawing the problem by putting it in. The important bit being showing the position of the linkage above and below the connecting point. I use the name Designer but I am not one. I could not be bothered to start up the Laptop and do a CAD drawing (then transfer that onto my PC) so did a freehand one.