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I have Briggs 18.5 horse and after I mow for a while the motor will bog down and quit unless I dis-engage the blades. I removed the spark plug and it looks wet. I replaced it and after a short time again it does it again. Cleaned the air filter changed oil. Any suggestions.

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If the engine runs ok when the blades are not
engaged then the engine is all right. Maybe its a faulty safety blade switch or a wire to the switch is stripped and is earthing to the body. Stephen

Posted on Sep 06, 2009


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I mowed half way through, the mower sputtered like it was out of gas. It picked back up but when I engaged the blades the power bogged down, and would only pull at a crawl, what do I need

Stop the engine, disconnect the spark plug wire(s).
Try moving the blades by hand.
Without being engaged, the blades should have a little resistance because they are still connected to each other. But shouldn't be hard to turn.
This will start you in the direction of finding out what's wrong.
A belt that's not in place, a bearing for one of the blades going bad, ect.

Sep 09, 2016 | Garden

1 Answer

It has been shutting down and it mows for a few minutes and shuts down. It shut down three or four times before I could finish. Could it have to do with the arm that engages the blades?

it could be. check all the connections be sure they are tight. maybe change the spark plug. it kind of sounds like the spark plug or coil is breaking down at high temperatures. or the fuel pump is getting clogged.

Jul 29, 2016 | Garden

1 Answer

Why do blades bog down when engaged?

I would take pictures of the mowing deck and then remove the the deck and do a cleaning on the bottom deck check each blade rounding pully to see if they move freely and would lubriate each of then blade pully assembly and then remount the deck back on tractor and check the belt tension and try it again.

Apr 04, 2016 | Garden

1 Answer

Lost reverse. Goes forward just fine. It has no codes. I am sure it is not a hydro problem more like electrical. Any Ideas?

you may receive more help if you list the manufacturer, model, and details such as it is a hydrostat, engine size (18 HP or 22 horse briggs motor). also describe your symptoms a little more as in: it ran fine last week then today when I started mowing it just didn't want move in reverse, or was mowing when it just quit working.Hope this helps.

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How to troubleshoot pto will bog down engine when you try to engage pto

when was air filter and fuel filter changed? are all pulleys turning free? spark plugs good? if everything seems good is motor wore out?

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1 Answer

Briggs 407777, type 0121-E4

The engine is not developing power and the presence of a load causes it to slow down and quit all together. Is there some sort of timing advance on that motor? In a car if the timing is not right that is exactly what happens when you put the car into gear and try to use it.

I would not mess with the valves till I check out the timing.

Nov 24, 2013 | Briggs & Stratton Garden

1 Answer

Hi, I have a John Deere Z225 with an 18.5 Briggs

Although, this does sound like a fuel issue due to past experiences I want to say the problem might not be fuel at all, but before we go that route try one thing. On that particular model I believe the gas cap is vented, if so try running it till it acts up, then remove the gas cap for a moment and see if the engine returns to running normal, if not I believe your coil is going out. I have seen alot of these engines recently where the works fine but when the get hot they quit functioning all together or only function part of time which in your case would indicate why it is missing and fowling the plug. When these tend to do this after they cool back down they function properly again until they get heated up again. I hope this helps you.

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1 Answer

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check spark then compression if both are fine rebuild carb

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