Hard Time Starting After Warm Up.

Here's the scenario.

Jeep cold starts fine. Runs great.

After turning it off and parking for a few, it is hard to start.

Usually i get a sound from the carb when trying to start that is like a loud angry burp, a puff of smoke, and no start.

Then if I open the throttle completely while turning it over, it will usually start.

I just replaced the old starter with a modern one.. but that is really the only new change.

It did flood really bad a few nights ago before this started.. could the carb just need a good cleaning after that?

Carter YF carb, f134...

 

Float valve? Crud in the needle seat, or time for replacement and adjustment?

 

its a manual choke, and its not hooked up at the moment.

it was recently rebuilt. but after that bad flood maybe it got crud stuck in there..

 

If it has been cold starting without the choke being "hooked up" then it's been flooding all along.


Or the choke flap is not open when it should be.

 

I guess I should clarify. The choke cable wasn't hooked up. The choke is there

 

I hooked up the cable the other day for the first time, and the whole engine ran really rough. eventually stalled on me. Unhooked it and it ran fine...

 

I stand by my earlier comments.

"Hooking up" the choke cable should not make any difference if things are adjusted correctly. (Flap full open and vertical when control is pushed in.)

And there is no way your F-head should start cold without it hooked up, AND control knob pulled out to close the choke flap.

The "recent rebuild" raises red flags. Is the fast-idle linkage, and etcera, properly connected/adjusted? Does it fully release the choke flap when warmed up? The float valve remains a suspect also.

 

Something is missing from the narrative.

 

Agreed.

 

Parking for a few? What type of time line are we talking about.

My jeep had poorly adjusted points would run when cold and wouldn't start when jeep was warmed up.

However flooding in the carb shouldn't happen.

 

Last night I removed and took apart the carb. Cleaned it up really well and set it back in place. Ran great, and when I turned it off and waited a few minutes, started right back up without a hiccup.

Is there a tutorial on how to adjust the choke/throttle linkage on this carb? I'd like to have a working choke.

Carb is similar to this:

 

Yeah I get the gist of it.. it idles way too high with the choke engaged. how do you adjust that?

 

Thats what I was thinking. Thanks Glenn

 

Between the throttle lever and the throttle body is an “L” shaped bar, with a tab that contacts the boss on the throttle, that has the choke/throttle connector rod attached. You only want to bend the rod enough, in the right direction so that when the choke is fully open the short tab on that bar is in contact, but not hard against the boss. Adjust the carburetor with a vacuum gauge and a dwell tachometer.
Click on the link How to Time Your Motor Without a Timing Light | Old Jeep Carbs LLC to find out how to fine tune the carb and timing.

 

Great info. Thank you!

 

So my issue is still there.. had someone suggest a thicker battery cable (running a 4ga now). He surmised that the coil was starved of voltage when cranking over..

the starter I was using was an old 6v, and really the only thing that has changed its the modern 12v starter that I installed before this started.

I'll upload a video of what's going on.