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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 13581
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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What could be the cause of my mower with a Briggs & Stratton

Customer Question

What could be the cause of my mower with a Briggs & Stratton engine to slowly die when i begin to push it forward and backwords? Cleaned the carb and tank along with checking the tank cap. I have plenty of spark in that it starts with no problem.
Submitted: 1 year ago.
Category: Small Engine
Expert:  Vince O. replied 1 year ago.

Hello, is the gas new? Is the grass high ?

Expert:  Vince O. replied 1 year ago.

Does it stay running when not trying to mow?

Customer: replied 1 year ago.
New gas and 4" high grass. stays running when not mowing
Expert:  Vince O. replied 1 year ago.

Does the engine have a primer or auto choke? Will it run better with the air filter off?

Customer: replied 1 year ago.
engine has primer
Expert:  Vince O. replied 1 year ago.

Try removing the paper air filter to see if any difference. Does it sound normal no load?

Customer: replied 1 year ago.
Tried that...engine runs normal with and without filter..filter is new...good normal rpm
Customer: replied 1 year ago.
engine loses rpm and slowly dies after running for approx 4 minutes
Expert:  Vince O. replied 1 year ago.

Does it restart easily when hot? Do you have a compression gauge? Oil is proper level?

Customer: replied 1 year ago.
will not restart for approx ten minutes. Has good compression....Oil OK
Expert:  Vince O. replied 1 year ago.

If all was well it should start right back up. Have a spare plug and check for spark as soon as it quits. Does it make any whistling sound? Check the head bolts, torque them in a criss cross pattern

Expert:  Vince O. replied 1 year ago.

Did you make sure fuel flowed from the tank through the hose steady?

Customer: replied 1 year ago.
I have fuel flow and checked head bolts while shroud was off. Did not check for spark after engine quits. No other abnormal noises. The engine dies when it heats up. Cooling fins are clean
Expert:  Vince O. replied 1 year ago.

What was the compression reading?

Customer: replied 1 year ago.
I don't have a gauge... but I don't feel any leakage when running. Takes a good pull on the starter rope. Last year installed a new head gasket.
Expert:  Vince O. replied 1 year ago.

The valves could be a little worn and the valve lash may need adjusted.

Customer: replied 1 year ago.
I will try that tomorrow. Thanks
Expert:  Vince O. replied 1 year ago.

Do you have a shop manual? If not would you want one?

Customer: replied 1 year ago.
I do have shop manuals covering these older model engines that cover specs and instruction. thanks
Expert:  Vince O. replied 1 year ago.

You're welcome. Good luck!