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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 12592
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: 8 months ago.
Category: Small Engine
Expert:  Vince O. replied 8 months ago.

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

Expert:  Vince O. replied 8 months ago.

Does it stay running when not trying to mow?

Customer: replied 8 months ago.
New gas and 4" high grass. stays running when not mowing
Expert:  Vince O. replied 8 months ago.

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

Customer: replied 8 months ago.
engine has primer
Expert:  Vince O. replied 8 months ago.

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

Customer: replied 8 months ago.
Tried that...engine runs normal with and without filter..filter is new...good normal rpm
Customer: replied 8 months ago.
engine loses rpm and slowly dies after running for approx 4 minutes
Expert:  Vince O. replied 8 months ago.

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

Customer: replied 8 months ago.
will not restart for approx ten minutes. Has good compression....Oil OK
Expert:  Vince O. replied 8 months 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 8 months ago.

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

Customer: replied 8 months 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 8 months ago.

What was the compression reading?

Customer: replied 8 months 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 8 months ago.

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

Customer: replied 8 months ago.
I will try that tomorrow. Thanks
Expert:  Vince O. replied 8 months ago.

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

Customer: replied 8 months ago.
I do have shop manuals covering these older model engines that cover specs and instruction. thanks
Expert:  Vince O. replied 8 months ago.

You're welcome. Good luck!