It is normal for a little gas to be present in the oil. This is why it is important to change the oil at least once a season. If there is a lot of gas in it then I would say that the carburetor is malfunction or isn't properly adjusted. Too much gas flow and it leak into the oil.
On my riding mower, the problem was originally caused by water in the fuel. This can originate from your local gas station, or in my case a gas cap with a "fuel gauge" built into it, which eventually allowed water to leak into the tank.
The water settles to the bottom of the carburetor float bowl, eventually rusting the float needle, which no longer shuts the fuel off completely. This allows fuel to drain into the crankcase and contaminate the oil.
My solution: Drain and replace oil. Clean float needle until it successfully shuts fuel flow off (or replace needle if necessary). If you have one of the aforementioned "gas gauge" type fuel caps, toss it and replace with a standard vented cap. And MOST IMPORTANTLY - if your mower does not have a manual fuel shutoff valve, install one ASAP. They are available at any mower shop for a couple bucks. Simple inline installation, just cut gas line in a convenient location and plug the valve in place. Now you can shut the fuel supply off when not in use.
Of course, I figured all this out AFTER I replaced the connecting rod and patched the hole in the block!
The fuel system on a Briggs and Stratton engine works by fuel being gravity feed from the fuel tank. Fuel goes to the carburetor where air and gas the mix, after the air and fuel mix it is feed into the engine where the engine goes through the four strokes.
There is no "gas oil ratio", the 3.5 hp Briggs and Stratton engine is a four-stroke design, oil should NOT be put into the fuel!!!
I have a 14.5 Briggs and Stratton engine on a Ranch King riding mower that will not start. After spraying starter fluid into the head, and air cleaner it fires for a second, but will not run. It is getting gas.....coil??? or something else?
No you do not put oil in the gas - 4 hp Briggs & Stratton motors are 4 stroke, not 2 stroke in which you do have to add oil to the gas.
Type your answer here... It backfires because it is a Briggs and Stratton - replace it with a Honda or Kholer.
A Briggs and Stratton L head twin engine wills pit gas out of the carburetor and flood out when starting if the diaphragm has been damaged. This will cause excessive fuel to enter the carburetor.
not getting gas.... needs carb cleaned
Its a 4 cycle engine.......gasoline only
Usually, the oil cap is screwed on; to unscrew it, turn it counter-clockwise.
For a Briggs and Stratton motor 3.5 motor used straight gas and oil in the crank-case, there is no ratio.
bad gas, dirty carb needs new sparkplug. youtube has repair vids on how to do what. user (davidsfarm) has great tips
Clean out the carburetor with gas, the reason it wont keep running is its not getting enough gas through the carburetor.
If it is a brand new engine take it back to where you bought it. Because if you do anything to you will void your warranty.
It may be one of two things. Either it isn't getting enough gas, or to much
The way to drain gasoline from a Briggs and Stratton lawn mower is to take the oil cap off and drain the oil. From there, run a rubber hose into the drain and siphon the rest of the oil and gas out.
Loosen the carborator and let the gas out, or just let it cool down
drain the oil and put in fresh
Remove gas tank and plastic shroud covering engine. Remove metal engine shroud and debris screen. Starter pulley and recoil assembly are underneath screen.
if the engine only runs when gas is poured into the carb it is generally caused by plugged jets and/or stuck needle in the seat. if it has been sitting for a length of time the fuel has either crystalized causing the plugging or the ethanol has caused a problem. if it is a new unit, briggs recommends tapping the carb lightly with a hammer to loosen the needle in its seat. for one reason or another the engine is not getting fuel through the carb
Most likely the needle valve & seat in the carburetor bowl is defective allowing fuel to flow when the engine if off. This excess fuel will run into the cylinder and down to the crankcase. Replace the needle valve & seat.
If you unit has a Fuel filter on it, I would try changing it. If not your fuel line might need to be replace.
Assuming you are talking about lawn mower engines, it is located on top of the gas tank. The gas tank is of course where the gasoline is poured into.
It shouldn't. If you have a dip stick to add oil, you won't also need mixed gas