How to convert a small gasoline engine to Natural Gas or Propane.


In this video I converted an 14 year old gasoline engine to run on natural gas. The engine had not run for over 6 years and the carburetor was completely ruined as a result of ethanol gasoline.


The statements about Obama in this video are about his refusal to repeal the stupid 2007 Clean Air Act passed in 2007 by the Democratic controlled congress and singed into law by that moderate turncoat George Bush. The Clean Air Act of 2007 mandated an annual increasing use of ethanol to be mixed with gasoline. In spite of an abundance of scientific evidence proving that the use of ethanol is more harmful to the environment then using plain gasoline, the facts that this law has led to massive deforestation to make more land for corn crops, has caused detrimental food price increases on struggling Americans and food shortages around the world, and is actually very harmful to small engines and older vehicles, Obama continues to cave to the brainless environmentalist and greedy corn lobby and refuses to repeal this harmful legislation.


I want to make it clear here that this video is intended to show a very simple way to convert a gasoline engine to natural gas. This method, while effective, is not the best way to do this and provides no safety mechanism in case of a fault. Consider this method as a temporary method only to be used in an emergency situation. As this method provides no safety switch to shut off the gas flow in case of motor stoppage, I recommend that this method only be use in an outdoor environment and with continuous supervision.

This method will only work for gasoline engines that run at a constant speed, such as generators or lawn mowers. In the case of generators, that do run at a constant speed but require more fuel under heavier loads, you may have to adjust the gas flow to where the engine is running a little rich (too much gas) while idling so that there will be enough gas to compensate for the increased demand when the generator is placed under a load.

1. This method is to be used only by old fashion true rugged individualist Americans that still have some common sense and believe in personal responsibility. Americans that understand that you are responsibly for taking care of yourself and making wise choices and that if you blow yourself or your house up while doing something, that it is your fault and not someone else’s fault.

2.This method is not to be used by this new breed of fake Americans that believe that it is everyone else’s responsibility to protect them from getting hurt or hurting themselves and that if they get hurt while choosing to do something of their own free will, that someone has to compensate them for it. Fake Americans like those that believe that if they choose, of their own free will, to play football and end up with brain damage that they have the right to millions of dollars because nobody told them that getting body slammed by 300lb linebacker and getting knocked senseless over and over again hundreds of times might have some lasting mental effects. If you are one of these fake Americans that thinks this way, please for the love of Pete, do not follow this video!

The Bottom Line.
This method works but provides no safety mechanisms. I use it and have never hurt myself or anyone else. Use at your own risk! Use your own brain and common sense if you choose to use this method. Natural Gas is highly explosive and very dangerous. If you blow yourself up please act like a true American and take responsibility for your own actions and do not call me.



23 thoughts on “How to convert a small gasoline engine to Natural Gas or Propane.

  1. i would suggest setting the speed using a tach, they are expensive for small engines but you won't overspeed the thing which will damage it. small saws like the huskavarna are often over sped out of the box. that is in part what will kill them

  2. I have what may be an even older, but great condition (I bought it new), Powermate 5000 / Techumseh MH100 10HP combo like yours. Mine has the crankcase breather just hanging down and the carb only has one port for the gasoline. I was considering buying a newer two port carb for it as they cost less than $ 10. I want to have the confidence that if the engine stops the LPG / NG will stop flowing. If I buy one of the vacuum demand KN type regulators (Century, Impco, etc.) do you know if their will be enough venturi effect to operate and shut off the regulator if the engine stops?

  3. Natural gas and propane are better than gasoline whether the gasoline has ethanol or does not. Aluminum and brass are used because of their corrosion resistance. Companies are now making engines specifically to run on natural gas and propane.

  4. You!

    Yes, Sir I am talking to You!

    I want to thank you for sharing your knowledge and making this video. You're a genius man!

    Here in California natural gas is about 3 to 4 times cheaper than electricity per kWh. So screw Thomas Edison.

    Time to bust out my little generators! We're having A.C. on full blast the rest of the summer!

  5. Very true, new cars use stainless steel, brass (high quality material by the way) , and polyethylene parts in modern fuel injection systems, therefore are not affected by ethanol. Small engines use plated steel parts and aluminium parts that oxidize and corrode with ethanol therefore u need to buy a new carburator every two years.

  6. old video, but it shows you can plug in LP or NG and an engine will run. not efficiently, but it will run.
    thing is, that LPG in the portable quantities youd put on your mower are more expensive than ethanol gasoline. even figuring in the cost of a replacement carb, you're still ahead financially than running LPG tanks.
    $3-5 to mow my lawn with LPG vs under $2 gasoline

    gasoline has more potential energy than LPG or NG. nowadays we'll just clean the carb more often. $3 can of Gumout once a year maybe 2x
    I found my 3.5hp B&S mower uses 0.6 gal gasoline for my small lawn or 2.4lb LPG for the same.

    factor in the danger of using compressed gasses, and safety can be a concern. filling a tank, hooking up regulator or valve, isnt something youd like to do often. much more caution is needed when refilling LPG tanks.

    Bottom *line*. NG and LPG conversions just are not practical in summer 2017 with gasoline prices right around $2.15/gal (Ohio) and LPG about $1/lb..

  7. I think my next garage project will be a home made gasifier (wood burner) connected to my generator. Not sure what Obama's opinion of a gasifier is if any.

  8. I have this same exact generator. I tried to run it on propane. It would barely run. It's not getting enough gas. I have the gas hose hooked up to the original gas tube on the carb. I don't have any other port. The engine vent is not hooked up to the carb it vents to the air. I'd really like to run it on the propane.

  9. Cool. I have that same gen. Any ideas on why it would quit potting out power? I don't know gens so I have no idea where to start. The breaker didn't trip. Other than those I don't know where to look.

  10. Is there any problem as this is dry fuel and petrol is a wet fuel which is a coolant and lubricate, admittedly not great at both but still is in the running equation. As you say though the proof is in the pudding and seems to work Ok.

  11. Just a few things I like your video very much and very informative . In addition the added notes are a very good thing. I liked the common sense and not the fake Americans comment I enjoyed very much. I definitely put your channel in my directory

Leave a Reply

Your email address will not be published. Required fields are marked *