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It's going to need a carb kit to fix the problem. Make sure your gas cap is venting ok, because gas expands in the summer and can force gas to pass thru carburetor and flood the cylinder then passing down into the oil. Depending on the age of your mower, the carburetor may have a gas shutoff solenoid on the bottom and this may have malfunctioned. Another is a bad float or needle valve which a carburetor kit would fix. A needle kit with bowl gasket may be all it will need. Hope this will help.
Sounds to me like your float valve is obstructed by some debris. This is causing it to stay open and leak fuel. Better it leaks to your vent hose than it leaks in your engine and contaminates your oil.
You need a proper carb cleaning. Not some run in the gas tank sh*t. If the tank wasn't full when parked, chances are there is rust in the fuel system to get this out you need to disassemble the carburetor and thoroughly clean it.
Try not to ride the bike til you do this. It's a fire hazard.
Gas in oil usually gets there in a 4 stroke engine in one of 2 ways- through the induction system from a defective valve in the carburator, or a ruptured diaphragm on a fuel pump that is attached to the crankcase. If the carburetor has a float bowl, the float may be faulty, the needle and seat may be faulty or dirty, otherwise the diaphragm types can have either or both types of valving to control fuel flow into the engine.
Check your oil level. If your vacuum petcock or float bowls are over flowing gas into the engine, your oil is diluted with gas, the crankcase is too full, gasoline diluted oil is blowing through the breather tube into the air box, and from the air box into the carburetor. Needles sticking in the carburetors can happen at any time even to new motorcycles. If you have vacuum petcocks inspect the vacuum diaphragms for leaking. Clean the carburetors and replace the float needles if they show wear. Change the gas fouled oil and filter. Hope this helps.
sounds like there is alot of dirt in the carburetor and it should be pulled apart cleaned and rebuilt with a new kit that comes with the necessary parts.also install a new accelerator pump in the carb.change the oil and dry out the plugs if they are in good shape.
see if the oils coming out of the rubber hose by the air cleaner ,if it is it could be the pcv valve the rubber hose is connected to. order could be too much oil in the engine, sometimes the carburetor will flood the crankcase with gas , you have to rebuild the carburetor and change the oil.
Have you checked your oil? You need pump oil half way up in reservoir. Open plug on top of pump and check oil. Pump takes SAE 20 or 30
Next, open oil plug below engine and check your oil level. It should come up 1/2 way on dip stick. Engine takes 10W30. Don't turn washer on its side or upside down to drain oil or oil will run into carburetor.
Is the water turned on? Are you holding gun trigger open while starting? Pump needs water flow. DO NOT tie gun trigger open with wire and then start engine. That gun will flip around and shoot a hole in your leg.
If the engine starts, then you have gas, spark and compression
If engine won't stay running, the exhaust port might be clogged, or the carburetor is not letting in enough gas, or gas is not flowing to carburetor.
Check the screen over exhaust port > is it dirty or clogged? Clean with WD-40 or break it out with a screwdriver. Remove gas filter below gas tank >>> it has a hex bolt >> loosen bolt >> the gas should come flowing out >> put it back if gas comes out Next remove rubber gas line feeding gas to carburetor >> gas should flow out this line too >> if flows then put it back.
What about your air filter? Take it off. See if engine fires and runs without air filter. Air filter may be clogged.
While air filter is out, you can see open port to carburetor. Spray some WD-40 into carburetor. Fire up the engine. It should spark real healthy on the WD-40. Keep spraying WD-40 into carburetor to see if you can keep engine going. Don't forget to keep gun trigger open so water is flowing and pressure is not building in pump.
If engine keeps going with WD-40 but dies without it, then your carburetor is very suspect. You might need a new one.
If engine will not keep going with WD-40, then the spark is very suspect.
Change spark plug. Try again. If it doesn't fire up after that, you need to take it to the shop for repair.
Dissamble carburator. Spray Carburator cleaner through passages, and wash out bowl. Dump gasoilne if old. Reassemble Carburator.
PS count the turns on the two Jet (mixing) screws and place back into the same position after cleaning passages.