Weak starter

[6872xtc]

The truck avenger came off my uncles jeep with a beefed up straight 6, I watched him idle thru some crazy angles with that thing

It may need richer jets because of how much air is going through it. The velocity through the carburetor could be higher than when it was on the six cylinder and it needs just a little more. Not sure, but I believe that it is a possibility. I would not make large jumps though.
But maybe you are right that it just needs torn down and cleaned after sitting.

 

[Cadden]

It may need richer jets because of how much air is going through it. The velocity through the carburetor could be higher than when it was on the six cylinder and it needs just a little more. Not sure, but I believe that it is a possibility. I would not make large jumps though.
But maybe you are right that it just needs torn down and cleaned after sitting.

If anything i just realized I can try the truck avenger carb, and at least just run it until I rebuild the other one. I don't plan on off roading anytime soon anyways

 

[diesel4me]

Ethanol likely made the passages get white crusty crap in them if it sat awhile...small engine carbs often exhibit the same symptom after they sat,you must leave the choke partly closed to keep them running,and adjusting the mixture screws has little or no effect..usually I have to use a needle to poke the hardened shellac out of a jet passage before it'll run right again..

I used a 450 CFM Holley Economaster on a '74 GMC 454 I had,a few guys told me "you'll burn the valves,thats too lean for a BBC"--but it ran great and the spark plugs always had the nice tan/brown deposits that indicated it was not too lean..
GM had factory 2 bbl carbs on 455 Olds engines back in the '60s too,with over !0:1 compression..

 

[Cadden]

Ethanol likely made the passages get white crusty crap in them if it sat awhile...small engine carbs often exhibit the same symptom after they sat,you must leave the choke partly closed to keep them running,and adjusting the mixture screws has little or no effect..usually I have to use a needle to poke the hardened shellac out of a jet passage before it'll run right again..

I used a 450 CFM Holley Economaster on a '74 GMC 454 I had,a few guys told me "you'll burn the valves,thats too lean for a BBC"--but it ran great and the spark plugs always had the nice tan/brown deposits that indicated it was not too lean..
GM had factory 2 bbl carbs on 455 Olds engines back in the '60s too,with over !0:1 compression..

Now that I think about it, it broke down on him before he took it all apart and the custom weird gas tank had 3 or 4 different colored layers of gas in it

 

[Cadden]

This was the jeep it came out of. Pretty nice

Air lockers front and rear. Lots of modifications.

 

[Cadden]

Lol. This is fine. Also, explains a lot

 

[Shawn]

Is that from old fuel?

 

[Cadden]

I'm guessing from his bad tank of rainbow colored gas

 

[Wes Harden]

Water in fuel dam ethanol

 

[diesel4me]

I read about a tip on a motorcycle forum and tried it,it works great to clean carbs that have that white pasty ethanol & water deposits in them..
The trick is to BOIL the carb's hard parts (take out any rubber diaphragms or plastic parts,don't put a brass float or a foam one in it either)-- in white vinegar or pure lemon juice (make sure its real juice !) and let it simmer awhile,it will come out like new..but I'd do this outside or in the garage,because its not exactly a pleasant smell..

I had a few ancient small engine carbs that looked like they were so badly corroded and full of that white junk they would never run an engine again,they came out nice and ran good after the cleaning..

They claim the acid in vinegar or citric acid in lemon juice breaks down the grain based ethanol much better than carb cleaner or other solvents and I believe it,I've tried MEK and Acetone and they hardy touch the white crap..boiling seems to get it out of the internal passages better than plain soaking too..

Another trick I read in an old Hot Rod magazine was to use Sani-Flush or Vanish toilet bowl cleaner,soak it in that with water for 15 minutes--beware brass,rubber & plastic parts will be damaged or ruined if you leave them on,and its best not to soak the carb too long,as it can eat into the die cast ..

One guy on a tractor forum uses battery electrolyte to clean really bad carbs on antique engines,works great on rusted gas tanks too,but of course its so corrosive you cant leave things in it very long..