Solex stumble?

My 134 did the same after installing the Solex.A few things to check: fuel filter and fuel line,the filter in the carb itself,engine timing,coil,(if you have replaced the coil and it has an internal resistor, you need to bypass the external ballast resistor) These made a big difference in mine, but I still have a little hesitation. Am going to add a Pertronix electronic ign. soon, maybe that will help also. I've heard from many people here that it is an improvement. You may want to check the clutch adjustment, that may bog the engine down a little also if it's not adjusted right.

 

I am running a solex with the stock F134. I know about the stumble you are talking about. For me that is trail speed when I am driving it around the farm. Just as Kelley did in the above post, I replaced the inline fuel filter and cleaned out the carb filter just below the fuel inlet.

I also played a bit with adjusting the fuel / air mixture adjustment screw. With the engine warm and running at idle speed, I adjust the mixture screw until the motor is running as fast as it can at idle. I assume, this is about the optimum setting. Then I can adjust the idle setting at the linkage to get the rpm to about 600 rpm for idle.

Have you done a full tune up with points, plugs, condenser and new plug wires? You would be surprised of how much that will help an old motor. I would first recommend changing your plugs. They might be fouling out a bit with some carbon or gas..

And sometimes when my motor is running a bit sluggish at idle. I will take her for a spin on the highway (about 50 mph) and drive her about 6 miles to our closest general store. Fill up with gas and drive it back home. Seems like this 12 mile drive helps get her running better. And this maybe is just getting the spark plugs hot enough to burn off any un bernt gas and increasing the spark of the plugs. Most of my driving is really slow idling around the farm at probably around 1000 rpm. And I have a bad habit of doing a lot of lugging of the motor with my old man style of driving. I don't think my old 1956 could handle many more red line shift points.

Looking forward to hearing some of the other guys solution to this problem. Hopefully they may have a better solution.

 

I have the same problem with my solex and thought that the accelerator pump might be the problem. I'm going to try the fuel line filter route and still replace the accelerator pump.

 

Same stumble here , But to be honest I KNOW that little filter in the carb has a bit of trash on it because Ive been taking it out every test run and cleaning debris off of it. I plan on replacing the big inline as soon as I run my first tank full of gas out. Im not going to adjust any thing till I get finish my first tank also because the more I run it the better it tends to run.

 

Had the stumble. The guy that had it before me said he couldn't get it out. Combination of plugs points wires large see through filter and fuel pump still had it. Took me about a week working in afternoon tuning, made sure had no vaccume leaks, which I did and fixed them. Anyway seemed to all come together with alternate turning of idle and mixture until it was gone. I did find that mine finally went away just after I moved past the too lean/backfire and idles at about 550 to 600 rpm. Oh by the way Steve that is one good looking flatfender in your avitar. Might treat us to some larger pics of it from time to time.

 

X2