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Mower revs up and down

Pulled carby of and cleaned out put new air filter and fuel in still no good

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  • kevin richards Feb 11, 2012




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Gday mate ,geoff here, 2 solutions i can think of, 1st, most modern mowers dont atually conect the hand throttle to the craby, it goes to a lever in the top of the crankcase under the pull starter, and has a fan control via the amount of wind pushed onto the vain that then conects to the carbeuretter, this is a 2 fold system that stops the engine reving out of control, and also sets the engine throttle due to the load on the mower blades, the other one is that there will be a small gauze in either/both, the fuel tap and arby fuel inlet, hope this helped, geoff.

Posted on Feb 11, 2012

Testimonial: "thanks, Geoff."


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Posted on Jan 02, 2017

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SOURCE: gas pouring out of air filter

carb is gummed up from the old fuel turning to varnish and clogging the jets. while trying to start, its trying to inject fuel, but its clogged and taking the path of least resistance (coming out the air filter).

you'll need to drain the gas tank and remove the carb to clean it out. if unfamiliar or uncomfortable doing this, then take it to someone to do a carb cleaning.

Posted on Jan 31, 2009

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SOURCE: 4.5hp B&S engine on a bolens mower..won't idle steadily

This is called hunting, your fuel-air ratio is not right. Your carb. jets need cleaned

Posted on Sep 05, 2009

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SOURCE: I have a Craftsman 625

My name is Dane and I am going to try to help you solve your problem.

I believe that you have clogged jets/passages inside of your carburetor. This can happen when an engine gets little use, allowing the fuel in the system to get old and begin breaking down. If fuel is left in a Carb for more than a year, it can eventually turn into a jelly like consistency, and clog the fuel system. What I believe is happening in your case is that the float needle inside the Carb is not allowing gas to enter the carb fast enough to keep up with demand. That's why it will run for 10 minutes and then shut down. After it sits for a while, the float bowl slowly fills back up and it will run for 10 more minutes.

Now for the bad news. This is an extremely difficult carb to work on. It is all I can do to get these Carbs off an engine and back on again to clean them. They are tough because you have a big air filter housing and 2 long bolts with gaskets and then the carb itself and spacers, that you have to hold together as a unit and start the bolts holding the carb to the engine. If you are a good enough mechanic to do this, you will already know how to do it. If not, I honestly suggest you take it to a shop and let them clean it for you. A new Carb isn't all that expensive, so you may want to consider just letting them replace it instead of cleaning.

I hope I've helped. If you found this information useful, please leave feedback as deserved. Thank you! Dane

Posted on Dec 04, 2010

  • 124 Answers

SOURCE: Have a B&S engine that will not stay running.


My name is Dane and I am going to help you solve your problem. I believe that you have clogged jets/passages inside of your carburetor. This can happen when an engine gets little use, allowing the fuel in the system to get old and begin breaking down. If fuel is left in a carburetor for more than a year, it can eventually turn into a jelly like consistency, and clog the fuel system. The other way to block these passages is to allow dirt or other debris to enter the fuel tank. This will be picked up through the fuel line, also clogging the system. The symptoms can be anywhere from a slight miss, to the engine not running at all. Always check your spark plug first before starting any troubleshooting procedures on an ignition system. Clean or replace it if it appears fouled, burnt or otherwise unserviceable.

You will probably need to remove, disassemble, soak, and use compressed air to blow out the jets in your carburetor. Pay close attention to how the carburetor is attached to the engine. Make a drawing if you need to or take some pictures. Remove the Carburetor from the engine. Remove the air filter, linkages, throttle/choke cables and fuel line. Remove the mounting bolts/nuts. You will need to disassemble the carburetor as far as possible and put it in some Carburetor cleaning solution. You can get this at any auto parts store. Do not place rubber parts in the solution. Allow it to soak in cleaner as directed, and then blow out the ports and jets with compressed air immediately after you take it out of the cleaning solution. Be careful not to get any spray back on your skin or in your eyes. Reinstall the Carburetor in the reverse order. Replace any worn or torn gaskets or o-rings as you assemble and reinstall it. Check the air filter and make sure it's clean and not oil soaked. Replace if needed. If you suspect your fuel was contaminated or old you should also drain, and flush your fuel tank. Dispose of your old fuel properly.

Just a TIP: Always mix your fuel with an approved fuel stabilizer. Fuel begins to go bad after a few months and that's why many people have fuel problems in the spring

I hope I've helped. Thank you! Dane

Posted on Dec 29, 2010

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hi there

if you had the carby off and cleaned it out , was the fuel flow from tank to fuel pump ( if it has one ) good , and was the output from pump to carb good on cranking?

if so and the breather in cap is venting , it could be that the governor needs adjusting, possibly have got a spring in the incorrect position and there is no binding , pay to check , carby main jet closly for any obstruction. check the fuel level and float hieght .

most times hunt / surge is caused by obstruction to fuel flow , or governor

try holding the governor in a fixed position if hunt / surge still apparent - carby is causing fault
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