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Have to choke or idle for mower to run

Have to choke or idle for mower to run changed gas and air filter was surging when warming up now have to choke or idle down for it to stay running. 4 years old

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Try a new carb kit.Thank you for asking and I hope this helps you.Please leave me a 4 thumbs up.

Posted on Jul 20, 2010

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Briggs Stratton 5hp I/C starts ok, runs, but will not rev


My money is on a partial blockage of the main jet or the passageway to it. You're having to force it to run through the idle jet by fully choking the incoming air. There's not enough gas coming in with the choke open to allow it to run.

I'm thiniking total carb disassembly, carb cleaner and an air compressor combined with a ton of patience will take care of the issue.

Mar 31, 2015 | Briggs & Stratton Briggs Stratton...

1 Answer

Craftsman riding mower dies after it gets warmed up


Check the choke. Typically these are automatic types on most new mowers. The choke is closed during cold starts then automatically open as the engine warms (think of it like a car that fast-idles in the winter, then slows down as it warms...it's not exactly the same thing, but in theory works on the same principle).
What could be happening with your problem is that the choke is stuck closed or partially closed, and remains closed after the engine warms. When the choke is closed when the engine is warm, it floods the engine with fuel and stalls (and can be difficult to restart, if you can get it to restart).


To test if this is your issue, operate it until it's warm and quits. Remove the air filter and check that the butterfly valve at the top of the carburetor is open. If it's closed, open it all the way (might have to put a screwdriver, or something in there to hold it open), then try to restart it. If it's open all the way, there is likely a fuel flow restriction to the carb, or in the carb, but these problems typically cause problems running the engine hot or cold.

Two recommendations.
1. Remove carburetor, and clean with spray carb cleaner. The choke is the butterfly valve visible where the air filter attaches. Check the linkage for debris, bent or restricted linkage. After cleaning and re installation, check for free movement of butterfly choke valve.
2. Prevention. There is not a lot that can be done, but to clean the carb/choke and throttle linkage during spring tune up before first use. May require more cleaning depending on amount of use. ALWAYS USE 100% GAS, NO ETHANOL. If you must use ethanol because 100% gas in unavailable, always mix with an additive that neutralizes the effect of the ethanol. Infrequently used engines (unlike cars) that use ethanol are prone to problems because the fuel system retains water. Carburetors do not like water, cause corrosion, and repairs can be costly. For example, Someone just gave me a nice (fairly new) Bolens Riding Mower (38" B&S engine - worth about $800 ) that would not run, they just got tired of it not running right and the cost of repair shop work was about $200. I bought a $65 carb on Amazon and now I've got a nice new riding mower. They saved $.50/gal on gas and I saved $740 on a new mower...yeah, baby!

Sep 02, 2013 | Craftsman Garden

1 Answer

The weed cutter will run ok on half choke but stop if choke is turned off to get full rpm,s


In most cases , if your having to use the choke to keep it running after it is warmed up, it could be the fuel filter needs to be changed. That is the first step. The choke is designed to shoot fuel into chamber a the engine warms up, the choke should go off. If a fuel filter is partially clocked it will restrict the fuel to flow freely to the engine. That means the choke has to do exactly that choke the engine. So herenis what I would do if it was mine, replace the fuel filter, air filter and make sure you good full oil and specially fresh gas. Not gas that has been sitting around in a can or tank all winter. Thanks mike

May 27, 2011 | Garden

1 Answer

My lawn mower is surging and spark plug is black is this lack of air briggs& stratton . plus runs ok when running out of petrol /????


Are you running it with the choke on? Also if the air filter is dirty it will do that as well. Black plugs means it's getting too much gas and is not getting the proper air to burn properly. Some engines if you rev them up with the handle right as fast as it will go automatically the choke is on.

Sep 01, 2010 | Briggs & Stratton Lawn-Boy Insight Series...

2 Answers

Briggs & stratton 550 / surges, gas hog


check your air filter. If it's clogged, the engine will spool up to keep from dying, run for about 15 seconds, then it will happen again. If that's it, just clean the air filter. Solved my problem

Jul 26, 2010 | Briggs & Stratton Garden

1 Answer

2003 BMW K1200LTE idles fine but surges mid range


Check throttle and choke controls are not sticky and air filter. If this is the injected engine the high pressure system seems at fault, you could try an injector cleaner additive that removes gum. consistent warm running suggests not a major problem

Sep 07, 2009 | 2003 BMW K 1200 LT

1 Answer

Engine on riding lawn mower surging


Dirty air cleaner.

Clogged fuel filter.

Replace or clean both...

May 29, 2009 | Garden

1 Answer

2 1/2 Briggs......doesn't run smoothly....surges at all speeds.


Hi, Check that you have the correct spark plug fitted or fit a new one as it sounds like your plug is getting hot then shorting out.
Sometimes the magnito can do this as well. but I would start with the plug.

Nov 26, 2008 | Garden

2 Answers

Hard starting and poor running


Hi,

Try running the engine without the filter and check if the idle would smoothen, maybe a little high. If problem persist, then it would be fuel delivery problem. If the idle is constant (but high), then some sort of blockage on the air filter or a vacuum leak.


Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Sep 10, 2008 | Garden

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