04451 Kits

natural gas generator conversion kit

"Celebrating 18 Years of Customer Service."

The #1 Factory Direct Supplier of Kits on the Web.

Best kits, best instructions, and best support. "Carburetion is all we do!"


We have Professionally Equipped Yamaha Generators Ready to run on Propane, Natural Gas and Gasoline. Click here to learn more . . .      Want help figuring out which kit to order?  First try our "What Kit Do I Need?" page and

also the new "Simple Explanation" page!





Some Kit Order Links on individual pages are no longer functioning.  We apologize for the inconvenience during this website update.  If the ones on your page are not functioning, please verify what kit is available for your unit and then

click this link "KIT LIST PAGE FOR ALL GENERATORS AND ENGINES" to go to this temporary kit listing page.


Search for any Generator or Engine number. See results below:


Help Links


ALL ENGINES 12hp or smaller use

A & C Kits


ALL ENGINES 13hp or Larger use

Type 1 Kits

Dedicated High Pressure Propane


Type 2 Kits

Bi-Fuel Propane and Gasoline


Type 3 Kits
Dedicated Natural Gas and Low Pressure Propane

Type 4 Kits
Tri-Fuel Natural Gas, Propane, and Gasoline


Remote Start
The parts needed to start a generator remotely by wire or even wireless


What Kit do I need?

Don't know what kit is best for your application?

Click this link for a Simple Chart that should help you decide what is your best kit choice.

Check Out


View Cart


Shop with confidence!


Official PayPal Seal



Thursday August 05, 2010

News & Features

Kit Production Update:


 is currently at:

1-3 days

As always, some kits take a little longer due to heavy order volume. 

Kit Center Regular Hours of Operation:

Monday thru Friday

9:00 am - 4:30 pm

Eastern Time.


If you require assistance please fill out a request form using this link

Tech Help

 or the email address found in your Master Conversion Instruction Booklet.




Use your credit card and safely and securely  order on-line.  Or call our office toll free at :


 Monday thru Friday 9-4:30 Eastern time.  You can place your order over the phone if you feel more comfortable doing that or if you would like to speak with a company  representative to answer any further questions you may have. 

Please check our BASIC INFO page first.




For our Canada customers call us here in the U.S. toll free at




04582 generac guardian

04451 Generac Guardian Ultra Source

If you're not sure what each type of kit means, click on the Quick Help Links to the left for more details.

Only the Type 1 & 3 Kits are available for this generator.  Clicking on the  Yes link will allow you that kit to your shopping cart.

 Accessories can be ordered using this link: ACCESSORIES



Type 1


Type 2

See below

Type 3


Type 4

See below



Ultra Source





Yes See Below Yes See Below

Note: This engine can also have a 2 barrel carburetor.  A visual inspection of the carburetor to see if the generator has the single or two barrel carburetor is required.  The single barrel carburetor is shown below.  If the generator has the 2 barrel carburetor the kit is the same as the 04582 with the GN990 engine.  Use this link to navigate to the GN990 page. 

Though we have had the GN760 single barrel carburetor in our shop for conversion,

Carburetor disassembled Converted carburetor

 we have not had the entire generator.  One customer sent us the carburetor and air horn assembly and we matched one of our existing adapters to the carburetor for bi-fuel and tri-fuel use.  The adapter has not been tested on an actual generator so it may or may not physically fit in the engine package (take 1-1/4" of space).  If you would like to try the multi-fuel adapter you can order the kit and as always we offer a money back guarantee.  If it will not work you can send it back for a refund.  Click on the pictures to see larger images. 

If you would like to order a Type 2 or Type 4 Kit to try, here are the links:


Bi-fuel Type 2 High Pressure Propane and Gasoline Kit




Tri-fuel Type 4 Low Pressure Propane, Natural Gas and Gasoline Kit


Use this link to CONTACT US by filling out a request form or contact us

in the U.S. at 1-800-553-5608

or toll free from Canada to our US office 1-800-486-0077.

US Carburetion Kit Center

416 Main Street * Summersville * West Virginia * 26651

Copyright 1995-2010  US Carburetion, Inc.  All rights reserved.