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Home > Ford Autolite Motorcraft > 4100 Carburetor
Autolite & Motorcraft Carburetor Main Jet
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Autolite & Motorcraft Carburetor Main Jet

Part #: 120-4
review 16 Review(s)
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Motorcraft Jets
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Motorcraft main jets, 1100, 1101, 2100, 2150, 4100, 4300, 4350. Priced per each. These are ordered by size .048, .058, etc. You will find the current jet number stamped on the top of the jet. Order by selecting the jet size from the drop down list. Price is per jet.

These are 5/16" on the threaded end.

Some of the older 2100 & 4100 Autolites are much smaller. Typically 1963 and older (assuming you are 100% sure you know the year of your carb.). This type of 4100 will probably have a plastic lever going to the secondary diaphragm. This type of 2100 & 4100 jet can be found here.

  • Made in USA
  • Number Stamped on Top

Motorcraft 2100 Jet Sizes

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.

Autolite 1100 Main Jet

Autolite 1100 Jet

Customer Reviews View All Reviews
Rating motocraft jet
high quality item. perfect fit to my 2150
Reviewed by: from israel. on 9/1/2014
Rating AutoLite 1100 68 Mustang 200 CI
Jets work perfectly and were a perfect fit. My inline six was running so rich that raw fuel was shooting out the exhaust pipe. I slowly worked my way down from a .065 to a .050 and have grey spark plugs on every cylinder. Im now getting 26 MPG. Very happy with the quality of parts, amazing customer service, and fast shipping.
Reviewed by: from Michigan. on 4/1/2014
Rating 052 Jets for Motorcraft 2150
These replacement jets fit perfectly and work well. They were shipped out quickly and arrived a day sooner than I expected. My truck was running far too rich and replacing the 055 jets with these 052 jets is just what it needed.
Reviewed by: from Chattanooga, TN. on 2/16/2014
Rating Motorcraft jets.
Perfect fit and resolved problem I was having with carb. Not to mention I got them super fast. Thanks Mike!
Reviewed by: from Colorado. on 11/24/2013
Rating Autolite main jets
The jets fit perfect it was just what I needed. Good price too. Thanks
Reviewed by: from California. on 9/17/2013
Rating tech
product is of good quality and was very pleased with the speed of delivery. thanks.
Reviewed by: from delta Co. on 9/16/2013
Rating Autolite 4100 main jets.
Appreciate the prompt delivery. Th jets were easy to install on my Autolite 4100. Made a big improvement in starting and idling I am happy with the prodict. I still have to go through the sizing process. Rusty R
Reviewed by: from Northern, VA. on 8/6/2013
Rating Grand Poobah
This order came quickly and once installed are performing to specs. I didn't give them 5 stars because only Jesus is perfect, but they are close!!
Reviewed by: from Longmont, CO. on 7/28/2013
Rating carburetor parts
The parts arrived super fast. Great quality and exactly what I needed.
Reviewed by: from La Quinta California. on 3/18/2013
Rating Car Nut
The jets I ordered were perfect! But the tech advice on the site was invaluable! I wanted to buy a couple of jets of different sizes, to be able to fine-tune. Mike helped me do that. VERY pleased! Don't overlook the tech pages - some excellent information there!
Reviewed by: from San Antonio, Texas. on 3/13/2013
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