Engine only runs with starter fluid

[Captain Obvious]

Well I hope I'm not sounding like a know it all either as I'm certainly no carb expert. Heck, I've never even taken the 72 versions apart. Haha!

 

Jarvo, Thanks for the info on the 72 alignment cones. I've held the 72 versions and looked them over casually but they weren't mine, so as much as I wanted to, I couldn't disassemble them.

 

And I'm loony, but if I was mixing and matching parts and had binding pistons, I would heat and dig out the existing nubs, make myself an alignment tool, fixture and lock the chamber into it's new correct position, and epoxy inject myself a new set of nubbies. A little release agent on the chambers before fixturing.... Clearly overkill, and a good example of why why my projects take ten thousand times longer than normal!

[Jarvo2]

I love these SU carbs and have rebuilt many sets over the past couple years.  Happy to help out fellow enthusiasts!  Its fun turning beat up and worn out examples and refurbishing them.  Here are some before & after pics...

 

 

 

 

 

 

 

 

 

 

 

 

[hatepotholez]

2 hours ago, Jarvo2 said:

I love these SU carbs and have rebuilt many sets over the past couple years.  Happy to help out fellow enthusiasts!  Its fun turning beat up and worn out examples and refurbishing them.  Here are some before & after pics...

 

 

 

 

 

 

 

 

 

 

 

 

Those look beautiful.

Alot of experience on this board, which I am very grateful for. This is my first vintage vehicle i'm working on lol. Been dealing on modern vehicles my whole life. Carbs are a total new experience for me! At work all I hear i is, "I remember when I used to work on those!".

Edited March 23, 2016 by hatepotholez

[hatepotholez]

So good news and bad news. Good news is, I replaced both needles on the original pots and now both are working properly. Bad news is my rear carb keeps leaking. My plugs are extremely fouled so I'll be changing those out. Should I separate the float bowl from the carb body and then retry the float setup?

[Patcon]

14 minutes ago, hatepotholez said:

my rear carb keeps leaking

Leaking where? How?

[hatepotholez]

From the vent after few minutes of running. Also with a slight tap on the fuel bowl it stops. 

[rossiz]

sounds like your float needle isn't seating.

[hatepotholez]

Thanks, if it's not one issue it's another. 

Edited March 28, 2016 by hatepotholez

[rossiz]

keep the faith - once you get 'em right, they're rock solid.

[hatepotholez]

I hope so...

[hatepotholez]

Here are the pics of the alignment tabs. 

[siteunseen]

You can take those float valves apart. Remove that small clip ring at the top and pull the pin out. There's a little cone shaped at the end. Mine are grey in color. There's also a spring in there you can stretch out for a stronger closing pressure.

Clean the pin and it's seat inside the body of the valve with a can of carb cleaner. Stretch the spring and it should be like new. Or buy new ones.