k, got this first gen week or two ago, and evr since i have had it, it bucks, and back fires, and stumbles(like it isn't getting fuel) to about 3 grand, then it is okay, also when i put it to the floor it runs great...... but anything under 3, and it will hardly get moving when i go to take off...... I have rebuilt the carb, and removed the rats nest, still the same out come... Any hepl would be greatly appreciated

 

cant point anything out myself. But someone help this guy, ive heard this story alot so someone should know wassup...

 

It's somewhere in the air/fuel delivery system or possibly spark system for sure, because I can't see it being anywhere else from your description.

If you've rebuilt the carb and you're quite sure of your craftsmanship than I'll believe you on that. The next things to check are your fuel pump and filter, your timing and your mixture. If your carb is rebuilt and running properly, your spark is there when you need it, the fuel filter is clean and you're getting enough gas, and your mixture isn't too rich or too lean, then I have no clue!

Jon

 

do a regular tune up, spark plugs, oil, coolant, fuel filter, timing, belts, air/fuel, everything. Just eleminate the obvious causes.

 

Check your leading ignition too. Sometimes they will run ok at higher rpms if the lead ignition is out, but really suck at the lower range. Also, if this is happening, the engine may seem to be hotter than usual even though the temp gauge reads fine (lots of ticking after shutdown). Good luck.

 

yeah, i am pretty confident in the rebuild, i'll do a tune-up on her, and see where that goes.... Also, one more question, the two vacuum lines on the dist....... can i get rid of those, or are the some kinda vacuum advance, and the purge valve for the oil (on the spout of the filler neck) should i leave that hooed up, or can i just stick a small filter on that and be okay

 

did you set your floats to spec, if float levels too high it will cause a rich condition @ low rpms which will cause it to spit and stumble and backfire.

 

huh, no i didn't, how would i go about setting the floats

 

haynes manual tells you how to measure them to set them to factory specs. yea you can remove the vacuum lines on the distributor it is a vac advance, lots of opinions on this, some like it some don't.

 

and before you go messing with your floats, when you look through the flaot sites where is the gas level, can you tell?

 

tried to start it today, and no gas was comin from the carb, i am gonna replace the fuel pump /filter and put a fuel pressure regulator on it to prep it for the ida's ehan i ever get them, i'll get back to u guys in a day or so if the problem persists after the pump and stuff

 

Leave the damn floats alone!

 

okay, pumps in, runs the same, the gas sits a little more than half way up the window.... Anymore suggestions

 

come on people, i'm dyin for answers here