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Wont run smooth

I have a briggs and staton engine on my mower and It starts just fine but it reves up and down it doesnt run steady. I have cleaned out the gas tank and the carb. and put in new spark plug and new air filter. But it still wont run smooth.

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Have the govenor checked could be the spring is worn down

Posted on May 10, 2009


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3 Answers

The throttle keeps reving up and down wont stop moving back and forth

Engine probably needs a static governor adjustment and possibly a carburetor cleaning. If you can hold the throttle butterfly steady by hand and the engine smooths out then it is the static adjustment that out adjustment.

Changing the spring length will cause the problem to get worse by making the governor more sensitive if shorten too much.

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Your best bet is to buy a B&S repair manual for your engine....installed incorrectly ,the engine may run way to fast !

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does it have a throttle cable fitted?? you really dont need an idle as as soon as you release the opc or dead mans handle it will cut out anyway. engine should be reving at 3000-3100 rpm. if this mower has a briggs and stratton engine fitted, remove the air filter and check the spring and linkege is still attached to the air vane govenor

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Swisher 60" pull behind mower with 14.5 briggs engine. good spark and the starter will crank just fine. If I prime the carb with a little gas it will start imediately but wont continue. Any ideas..

Hi Andy, the carby will need to be removed and all jets cleaned out with compressed air. Basically its not getting enough fuel through the carby to keep running. Regards Phil.

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1 Answer

Engine runs fine than after about 10 min it starts to surge and than quits will start up after a short cool down but does the same in a short time Frank

This seems to work a lot.
As the engine starts to surge, loosen the fuel cap.
If the engine runs smoothly again, clean the vent holes on the cap.
Good Luck.

May 02, 2011 | Parks Optical 13.5hp Briggs And Stratton...

1 Answer

My mower starts fine, and idles smoothly, but once I start moving, occasionally it will sputter, and the engine will lag a little, then will rev back up and then run smoothly for several more minutes...

Probably a dirty carburetor. Try some carb cleaner in the gas tank. If this is a Briggs engine, and the carb sits on top of the fuel tank, often times the pick up tube will become clogged.. You may have to remove the carb and spray clean it with carb cleaner spray can.
Also, spray the linkage on the carb.

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1 Answer

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I removed the engine and broke it all down last night. Inside the engine I found a mole. Once I removed the live mole and cleaned the valves - it worked fine.

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1 Answer

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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.

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