Won't Run Over 2000 Rpm

Hi all, I'm new to the forum. Just bought a 1966 CJ5. It's extremely rough but I chalk that all up to patina. My problem is that my friend and I can't get it to run above 2000 RPM. We have new points, new plugs, new rotor, cleaned the carb (the Solex). It starts using the starting valve. Idles forever. But stalls as soon as I give it any gas. We can baby it up to 2000 and that's it. Dwell angle is good. Point resistance is good. There do not appear to be any vacuum leaks. Fuel is good (new electric pump and for the time being we are pulling from a marine boat tank). We believe it's a carburetor issue. We do see some slop with the rotor – It can be turned 5-10 degrees – does not spring back. Any thoughts.

 

Thanks for the rapid response - heading out now to check with the timing light

 

Not sure what carb you have but an accelerator pump in carb can do that and it's easy to check. Throttle it by hand from under the hood and if dumping some gas down the carb fixes the problem, then you know. Don't go crazy with the gas, just an ounce or two at a time. Pour it in while you give it a quick throttle. Don't have your face over the carb in case of backfire. Wear a face shield.

Some of the old carbs have leather like seals on the pump and they harden. The new kits have a modern pump seal but in some cases are worse than the old ones. I had this happen with my carter. I ended up buying a OEM leather like seal and it hasn't given me a problem. The replacement rubber one failed within 6 mo.

 

Well, we tried the timing light - the mark stayed steady for a bit - then seemed to bounce around - then steady again. Nothing resembling a smooth movement. We'll try again tomorrow.

Thanks again

 

Thanks - we have tried pumping - the accelerator pump works fine. It's a relatively new carb - so we'll keep trying

 

You stated you have new points. Did you accurately set the gap at the highest point on the lobe? Did you check dwell? If the points aren’t set correctly, you can have some symptoms you’re experiencing.
What is “the starting valve”? the choke ? Try keeping the carb full or near full chock and see it it revs better.
Did I miss what engine you have ? F-134 four cylinder, or 225 V6?
-Donny

 

Have you checked the linkage to make sure it opens the throttle plat all the way......

 

Like Howard said....My bet is that your distributor is the culprit .

 

New points, gap correct, dwell on point. The Solex doesn't have a choke, it has some sort of starting circuit - never seen anything like it before. it's an F-134. - Thanks for reaching out!

 

Yes - thanks

 

I am thinking that as well. My friend thinks the springs may be gone on the weights. I'll pull it tomorrow and see what's up. Cold and dark out now...

 

I can't take it! I got to know what it is!!!

 

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New points can have oil or debris on them that degrades the contacts. I always wipe points clean with a piece of paper after filing and setting . AMHIK.

Sticky advance weights may also be a likely culprit.

 

The results from the timing light does seem to indicate something wrong with ignition, with the mechanical advance being the primary suspect.

 

no mention of condenser just cause its new doesn't mean it's good

 

x2