coachstaff
Junior Member
Does anyone have information on where I can get my zenith carburetor rebuilt?
Zenith Carburetor
- Thread starter coachstaff
- Start date
Brentwood Bob
Well-known member
Look at the top of this discussion under Webb sites. There is a listing for carburetor rebuilding.
30 Closed Cab PU
Well-known member
Lots of places, Berts in Colorado does them, they use flow tested jets, and install it on one of their cars and do a 15 -30 minute drive testing it before shipping.
Or you buy one of theirs rebuilt, and send yours in for a refundable core charge. Inquire about turnaround/wait periods, sometimes they are lengthy (months) if they are backed up.
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Purdy Swoft
Well-known member
Model A Zenith carburetors are VERY simple and lots of info is available . I feel that if a person has a model A , they really need to know how to work on and repair their own Zenith carburetor .
Usually , the gaskets and the needle valve assembly is all that I need to replace as long as the jets are original .
Renners offers flow tested jets .
A lot of the repro jets are too short and will continue to leak , no matter what you try .
Look up original jet length and measure the jets that are now in your carb .
Original jets are numbered .
If your jets are too short and are below the level of the gas in the bowl of the carburetor , it will leak .
Advertised float level is 5/8s .
I lower the float level a VERY SMALL amount less than 5/8s , so as to reduce the possibility of the gas sloshing in the bowl of the carburetor when coming to a stop .
When the float level is really high , sloshing gas in the carburetor will cause the engine to quit running when a quick stop is made .
I don't EVER drill out the passage plugs because of the risk of ruining the housing of the cast iron carburetor .
Practice makes perfect . Good luck , whatever the choice !!!
Usually , the gaskets and the needle valve assembly is all that I need to replace as long as the jets are original .
Renners offers flow tested jets .
A lot of the repro jets are too short and will continue to leak , no matter what you try .
Look up original jet length and measure the jets that are now in your carb .
Original jets are numbered .
If your jets are too short and are below the level of the gas in the bowl of the carburetor , it will leak .
Advertised float level is 5/8s .
I lower the float level a VERY SMALL amount less than 5/8s , so as to reduce the possibility of the gas sloshing in the bowl of the carburetor when coming to a stop .
When the float level is really high , sloshing gas in the carburetor will cause the engine to quit running when a quick stop is made .
I don't EVER drill out the passage plugs because of the risk of ruining the housing of the cast iron carburetor .
Practice makes perfect . Good luck , whatever the choice !!!
Ed in Maine
Well-known member
Always use cleaned, correct length, flow tested jets on a rebuild. Ed
Purdy Swoft
Well-known member
I don't think that jets actually wear out and need to be replaced .
As long as the jets aren't obviously damaged and are original numbered jets , I clean and reuse them.
If i'm not sure about the jets , I've got used original jets to compare them to .
Otherwise I measure jet length .
The main and cap jets are the jets where length is most important .
If the cap and main jets stand lower than the level of the gas in the bowl of the carburetor , gas will continue to overflow these jets and there will be a drip .
As long as the jets aren't obviously damaged and are original numbered jets , I clean and reuse them.
If i'm not sure about the jets , I've got used original jets to compare them to .
Otherwise I measure jet length .
The main and cap jets are the jets where length is most important .
If the cap and main jets stand lower than the level of the gas in the bowl of the carburetor , gas will continue to overflow these jets and there will be a drip .
Purdy Swoft
Well-known member
Another thing to check is the number of gaskets under the main jet .
The main jet installs under the drain plug with a slot head screwdriver .
After the jet is unscrewed check if gaskets are stuck and remain in the lower housing of the carburetor
This is often overlooked
Sometimes several gaskets will be stuck and remain in the lower housing
If more than one gasket is used under the main jet it will change the klevel of the jet and cause problems with leaks
Most good model A carburetor books warn about too many gaskets under the main jet .
The main jet installs under the drain plug with a slot head screwdriver .
After the jet is unscrewed check if gaskets are stuck and remain in the lower housing of the carburetor
This is often overlooked
Sometimes several gaskets will be stuck and remain in the lower housing
If more than one gasket is used under the main jet it will change the klevel of the jet and cause problems with leaks
Most good model A carburetor books warn about too many gaskets under the main jet .
Patrick L.
Well-known member
I'm with Purdy.