Bad Carb Or Gas?

I'm pretty pleased at how this 134f in my 61 fires up and generally runs but I was playing with it this weekend and I thought I'd check in here.

I'm trying to get my idle down to 600 rpm range but she just won't idle down there. The PO had it set up at 1100 ish .. and it was all messed up,

I put in a pertronix kit, new plugs , wires, ect. New coil and wiring for the most part. I know there is some play in the linkages and I fixed the throttle rod length , double checked the choke. I think I have it all right. The timing is about 5. btdc . New fuel filter, adjusted the idle screw on the carb. I cannot find a vac source but I think I'm close just using my ear..

She's running at 660 but doesn't necessarily like it. The plugs are clean and tan. Honestly the engine looks Ike it has seen a service at some point along with a rebuilt tranny .

Before I start tearing into this carb after i run more fuel though it . Are these carbs known to wear out? Am I better to rebuild my old carb or just get refurbished or new unit? I know this has been sitting for more than a year more like 3.. the brake master was rusted solid. A lot of what I see has just been slapped together like he got it running and it was good enough.

Thanks all,
Bob

 

Any carburetor will need a rebuild after 20-30 years, IMO. Not so much that it wears out as the gaskets and seals deteriorate with age. It's unavoidable. I presume you don't know the detailed history of past repairs and service. I have some experience with carburetors, and given the circumstances, would have considered a rebuild routine service.

You should be able to idle it down with the idle stop screw until it stalls from fuel starvation. The idle should remain smooth. If not, I would look for vacuum leaks first.

If you have old gas in the tank, siphon it out and get some fresh.

 

Also there are good YF kits and bad. Search old posts or ask - someone will chime in. I think Scoutpilot knows a lot about these F134 YF carburetors.

 

i am not specialist, and I have a Solex on my F134.
After some cleaning inside, checking, including spark plugs, all went well.
Of course something important is external temperature.
If it is cold, it takes time to have correct idle.
It is better to wait some minutes before driving. If not it stalls...
That's for mine.
Working on the screws on the carburetor allows to get the good solution, as Timgr says.
These engines are remarkably good and easy to have working well.
We just need to be patient!

 

Beore you do anything put some seafoam down the throat and some cleaner in the tank and run it,it could probably stand a good cleaning,and Scoutpilot would be the one to do it....I always flail around out of stubbornness and clean and assemble untill I can get them to run right....have not heard good things about replacement carbs for the most part.....agree with all that Tim said.

 

x2

 

When YF carbs get really old and worn, they can leak air around the throttle plate shaft at idle . Makes fine tuning difficult.

It is possible to rebush them, and kits are/were available, but it needs to be done precisely. (This goes well beyond the standard rebuild kits.)

I'd refer you to member Scoutpilot for expert advice.

 

Good point. If a carb mount has been over-torqued, the base flange ears can be warped, allowing a vacuum leak. Also check for leaks in other parts of the PCV system, vacuum pump/wipers if any, etc.