Mower will not stay running changed gas plug and oil

Give it a tune-up, spark plug, oil change, fuel filter, air filters... Drain gas completely from gas tank and carburetor... Fill with fresh fuel. White smoke from muffler means there is water in the system... Fuel "goes bad" as soon as 1 month.

The main reason why a mower starts up and then cuts off after a short period of time is because of poor air flow to the carburetor and is most likely a blockage somewhere.

First you should try this. Remove gas cap and filter then place a really thick rag over the top of the carb where the filter was and either blow into the gas tank or wrap a rag around a tapered air chuck and then place the air chuck in the gas tank (with rag fitting snug around chuck) blast it a few times and listen for bubbling, if it's bubbles then you have removed the blockage..
Take the carb off of the mower and clean the carb / jets with a thin piece of wire.
Be sure to clean the gas tank completely and the fuel line.
Check the oil level, some mowers have a low-level oil shut off.
Change the plug out with one thst is reccomended for your engine.
I wouldn't reccomend running the mower without the filter, that causes dirt and grass debri to enter the carb, fuel line and tank.

This should fix the problem, if it don't you should find a lawn mower repair service.

I hope this helps.

Clean the carb, gas tank and fuel line (s). Replace air filter with a new one, I wouldn't recommend that you run it without the filter because that allows dirt and grass debri to enter the carb, fuel line and gas tank.
Replace the plug with a new one that is recommended for your engine.
Check oil level.

Other option is lawn mower repair shop....

Hope this helps, I had the same problem.

Depending on which way the mower tipped over and how long it stayed that way there are a couple things you should check. First, the oil in the crank case. Many times when engines are on their side, gas can freely flow from the carburetor into the cylinder and down into the crank case. If this happened the oil level will be very high and the oil will be thinned out. A simple oil change will take care of this. Remove the spark plug and check the cylinder for gas or oil. With the engine on its side either gas from the carburetor or oil from the crankcase can fill the cylinder above the piston and make it hard for the engine to start. With the plug out, run the starter several seconds to clear the cylinder out. If oil is the problem, squirt some gas in the plug hole to thin out the oil so it will come out the plug hole when you run the starter. Replace the plug, check the oil level and try to start the motor. It may take several tries and the motor may smoke a lot when it starts. This is OK as it has to burn out anything in the cylinder to get back to normal.

Pull the spark plug and squirt alittle bit of gas or starting fluid directly into the cylinde rand reinstall plug . It will fire I promise. Repeat if necessary untill it stays running. Hope this helps

Gas in oil is usually a symptom of flooding, caused by a stuck needle valve or damaged float in the carburetor. But 65 hours is awfully "young" for this problem.

then i would say the injector in the carb is blocked

Check gas line. Check for a gas filter and replace it. Replace spark plug. If the prob continues - it might need the carb rebuilt.. If a small engine sits to long without being run - the gas will shellac in the carb and render it to not function properly..

have a great day !

Most common is a dirty air filter, followed by a plugged vent hole in the filler cap on the gas tank. Next would be fuel issues either in the supply line or in the carburetor.
Hope this helps, --W/D--

either the magneto or the governor is damaged check them