How to fix Honda GX390 surging idle 

Great video. No fluffing around, to the point

I really appreciate your video, it helped me solve the problem with my surging Honda generator engine. I watched dozens of videos on this topic and yours was the one that clued me in to the problem with my generator. Thanks so much for taking the time to provide this valuable tip!

Many thanks! Could be my problem too. Replaced the carb and is now worse. Will take a look at this gasket.

Thanks to your video I found the problem God Bless you!

Short, sweet and to the point.

Thanks my Rayco stump grinder was surging so I tightened the carb bolts and she's ticking over nicely also new plug and cleaned the tank filter

Thanks for posting this video buddy I really appreciate it

That's exactly what I thought it was, thanks for your opinion

I have a leaf blower with this engine that runs good until about an hour in then it starts surging and popping. The governor rod is moving like this when it starts, so I’ll have to check this out. Thanks for the video!

Nice info, it helped me to solved the problem of surging my honda generato engine , anyway hi iam from indonesia

Nice!! Thanks for sharing

Great I will try it on my GX270 Thank You

Mine does the same thing! I thought it was the throttle spring! Thank you!

In my case. Surging Honda GX 390 on a generator was surging only under 1/2 tank of gas. Tried solving it with new or no gas cap, new fuel hoses, filter, petcock, flushed gas tank, new Genuine Honda carb and even used aviation fuel. Still it would starve out near 1/4 tank and would only run while spraying starting fluid in the carb. Surging = Fuel Starvation, especially with less than half tank of fuel in my case, even when it was new. A generator runs at high speeds all the time requiring the highest of volume of fuel in the line at all times. Generators are designed to be low profile and an inherent flaw is that the fuel tank is (TOO LOW) just slightly above the carb fuel inlet for gravity feed through a hose. At high speeds and especially with little fuel in the tank causes a weak flow to the fuel inlet causing starvation/surging. MY SOLUTION: I discovered that by raising the entire fuel tank by 8" gave me MUCH better fuel flow down to the carb and the surging went away even with almost no fuel left in the tank. You can definitely see the difference (before and after) with a see-thru clear fuel filter which should always be at least 1/2 full during operation on a high speed motor/generator. Another mistake I made was storing Ethanol fuel for more than one season in my shed. The stuff goes bad and causes havoc on small engines. Periodically check the color of the stored fuel in a glass jar. It should be clear. If it is golden/urine colored, DONT USE IT in a small engine.. Car engines don't seem to have a problem with the aged fuel. I had about 20 gallons of yellow colored fuel and added a few gallons at a time to an almost full tank of gas in my car and it burned it with no problem. I hope this helps somebody as I almost gave up and it cost me $ and lots of time, but I won and learned a valuable lesson that nobody ever suggested to try.

hey i have this problems but also is low pressure is this associated with this problem? ,, meaning if i change the gasket will it fix the low pressure ?,, please reply as soon as possible,, nice video u earn a sub.

Guess I’ll have to check this on mine. I just replaced the carb and put a new gasket though so who knows.

Awesome thanks

Could you tell me where the governor spring attaches at the carburetor side?

Air leeks are the main reason for this.

I replaced the green gasket on my GX390 carburetor, because it was leaking, and it is still leaking gas behind the carburetor. I tightened everything down. Is there something I missed?

Did you find this by spraying some starter fluid or something on the carb and noticed a change in idle?

wheel size write how many inches

Follow up another common reason for this is the fuel jet being clogged

INDO