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Carter Metering Jets

Carter Metering Jets

Your Price:$5.25
In Stock
Part Number:120-27

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Carter AFB Main Jets
Carter carburetor metering jet. Price is for 1 jet.

To determine if your main jets are correct you will need to look at your spark plugs. A dark, or black plug indicates a rich condition. A light, or white color indicates a too lean condition. Move up, or down one size at a time, then drive the vehicle at a sustained speed for 20 minutes. Start the test over until you get dialed in. This is important so that you don't ruin your engine.

Most AFB & AVS carburetors will have matching jets in the primary and then matching jets in the secondary. The Weber marine, 4 barrel is an exception to this. The jets can be a different size one each side of the carburetor.

To compensate for higher altitude, change your jet .002 for over 5,000 feet. This is approximate because with the lousy fuel we have these days, the old ways of calculating sizes just aren't the same anymore. Using the testing method above is the best way to be sure.Carter used a 3 number system when marking jets. When the 1st number is 3, then the jet size is less than .100 inch. 365 would mean .065. When the 1st number is 4, then the jet size is .100 inch or more. 410 would mean .110.Jet sizes on the Carter carburetor can sometimes be hard if not impossible to read. In those cases use drill bits to measure the hole, then convert the drill bit to decimal.

Main metering jets for the Carter carburetor. Price is for 1 jet.
Includes:

AFB
AVS
Edelbrock
BBD - short jet. Some of the early BBD carbs used a long jet 1/2" or so.
WCD
YF
YFA

WD-0 - no gasket needed
Some Carter jets use a 3 digit number to indicate the size. Example 630 would = .063 in our list.

Jet Testing

To determine if you have the correct jets in your carburetor, operate
your vehicle for 20 minutes at sustained speeds. Stop and pull a plug.
Gray - Good, Black - move down one jet size, White - move up one jet
size. Do it all over again until you get a gray plug.

This assumes your engine and electrical system is in good running order.

WCFB Jet Sizes

Jet size: 5/16 x 24
5 Stars
Old mechanic
Mike's web page was the only place I could find with the information on my Carter carburetor. It listed the jet sizes and part numbers and also the metering rod part number. I ordered the jets, got them quickly installed them and the car runs much better.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from Florida. on 5/8/2017
5/5
5 Stars
Mr
Mike's was very helpful on Carter parts and had the jets, ball check and counterweight, and rebuild kit for an old YFA carburetor.
Did you find this helpful? 
Reviewed by:  from Montana. on 10/30/2017
5/5
5 Stars
Good stuff
Since picking up my dual WCFB vette, I've spent a bit of time working on the carbs. Probably dropped $150 on kits and other parts from Mike's. Everything has been super. I bought a number of jets to see if I could lean the carbs as I'm tuning them. These were just the trick needed. Thanks
Did you find this helpful? 
Reviewed by:  from Geneva, IL. on 5/26/2016
5/5
5 Stars
self
I purchased a coupe different jet sizes to tune my AFB. Jets worked great. Quick shipping. Low cost shipping. Great customer service. Will buy from you again.
Did you find this helpful? 
Reviewed by:  from Ortonville. on 5/8/2016
5/5
5 Stars
Jets
nicely packaged, great product, worked fine.
Did you find this helpful? 
Reviewed by:  from Taos, NM. on 3/28/2016
5/5
5 Stars
owner
Caretr AFB jets worked great, thanks.
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Reviewed by:  from georgia. on 7/31/2015
5/5
5 Stars
Metering Jets for Carter AFB
The metering jets for my Carter AFB arrived quickly and in perfect condition. I would highly recommend Mike's carburetor parts for your carburetor needs!
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Reviewed by:  from Knoxville, TN. on 9/30/2014
5/5
5 Stars
Mr.
amazed at how fast the order was filled and shipped. Received it in two days. Parts fit perfectly and really improved my car's performance.
Did you find this helpful? 
Reviewed by:  from Fraser, Michigan. on 6/17/2014
5/5
5 Stars
Owner 69Dodge
Great parts thank you, for your help
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Reviewed by:  from Silverbrook. on 8/8/2013
5/5
5 Stars
Jets
Fit like a glove, quality is awesome, thanks again Mikes
Did you find this helpful? 
Reviewed by:  from Carter AFB. on 3/22/2013
5/5

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