Best replacement Carb for 79 620

[Jetscat7]

I need to replace the stock carb.  I have tried to have it rebuilt and changed out the throttle pump.  It still has a flat spot and dies between  idle and secondary.  It seems like the primary is not hardly working.  What is the best replacement?

[banzai510(hainz)]

the main jet could be plugged.

open the fuel filter if lots of rust that could be it but most time it plugs the idle jet.

 

I like the weber 32/36 carbs/ Most like you get the 32/36DGEV which is electric choke.

[Jetscat7]

Do I have to replace the fuel pump for the weber to electric?

 

[difrangia]

No. Original mechanical pump will work. You need the proper adapter to mount the carb.

 

Be sure that you get a European manufactured carb. Both of mine have 'Made in Spain' cast into the carb body.

 

Redline or Pierce Manifolds are good sources.

 

There are Oriental knock-offs out there.

[datzenmike]

 $300 Weber conversion kit.... or just clean the primary jet..... hmmmmm give me a minute to think. Best carb for a '79 is a '79 stock carburetor. A Weber is not going to pass the next emissions test so the choice is clear.

[difrangia]

Above my pay grade, Mike. 32/36's flunk in Canuk or CA  ??

 

Educate me. My life's too simple, or not ??

 

Just Kiddin' !!

[banzai510(hainz)]

If you had it rebuilt did you check if the main jet is plugged.

 

[datzenmike]

On 3/9/2020 at 2:12 PM, difrangia said:

Above my pay grade, Mike. 32/36's flunk in Canuk or CA  ??

 

 

 

OP is from Long Beach California. Pretty sure it will have to pass a smog test being a '79. Has to have all original smog equipment on the truck to pass and that definitely means the '79 carburetor. Cheaper to fix the problem than trade for another.

[difrangia]

3 hours ago, datzenmike said:

 

OP is from Long Beach California.

 

Yup. I recall the 49-State car era.

 

I have a friend who was a lifelong CA resident who relocated from Bakersfield area to north-central Arkansas about six months ago. He'd been bitching, agonizing ,and planning the move for several years. Finally bit the bullet. Still has half a dozen aircraft hangers to sell off out there (also aircraft mechanic and businessman).

 

He likes guns and old machinery. He's a much happier camper in the Heartland.

[Jetscat7]

Does anyone know how to get replacement jets for the stock carb?  What size are they?  I am just going to replace old worn out parts as I take it apart.

[datzenmike]

Jets don't wear out, can't wear out. No moving parts and only gas runs through them. They can get dirt in them.

 

On 3/9/2020 at 12:02 PM, datzenmike said:

 $300 Weber conversion kit.... or just clean the primary jet..... hmmmmm give me a minute to think. Best carb for a '79 is a '79 stock carburetor. A Weber is not going to pass the next emissions test so the choice is clear.

 

My '78 FSM (factory service manual) uses the same engine and carburetor lists a 101 primary and a 158 secondary jet for California engines.

[Charlie69]

Provided it is not wore out or been sitting in a field full of water for a few decades!