Re: I have oil coming into carberater I think this is a...
PVC (Positive Crankcase Ventilation) takes oil mist from cylinder blowby in the lower crankcase and sends it back into the intake manifold, near the carburetor, to be burned.
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I suspect the hole is a tank vent hole. If the tank is hot and full, the oil inside expands and will come out of that hole. There is an oil tank vent assembly, and seems to be above the filler cap. The sears website diagrams are old sketches, hard to read.
If this is a 2 cycle engine it has oil mixed with the gas. But if this is a 4 cycle you may have overfilled the crankcase.
When exhaust shoots through the carburetor it is either a valve stuck open or timing issue. A stuck valve lets the fuel mixture come back out the engine.
There's a spring loaded check ball that is suppose to prevent oil from gravity feeding past the oil pump when the engine is off. Over time, the seat could pit, or the check ball itself could get a groove worn in it from the seat, or the spring could weaken (take a "set"). If your's is all original, let's face it, it's 42 years old! You could try a new ball and spring and see if that helps.
BUT, if it sat a looooong time, no matter what, SOME oil most likely will seep past the check vale, and get pumped out a vent. If after running a bit, and it doesn't do it again, I wouldn't worry about it.
The engine is either over filled with oil, or the machine has been tipped up allowing oil up the breather and into the air filter box, if the filter is a paper element type replace it, the smoke will clear eventually.
hi mate you float is to high in the carb take the carb off and take the bottom casing off and adjust the float to the correct measurements in the manual if the float is too high it is allowing to much fuel in and so it will flow over the over flow and out the tubes it is simple puch the pin out and adjust the metal where the little valve is hanging onto with a pair of long nose pliers good luck
Start with the simplest things first... remove the line from the input side of the pump... does fuel flow out nicely? If not, it's a clogged line and probably a lot of gunk in the tank... take off the filler cap and apply some low pressure air to the engine end of the line... if this unclogs it, you will hear a bubbling sound at the filler tube. if fuel flows freely, reconnect and take off the output line at the carb and, (after disconnecting the coil high tension lead and grounding it!) engage the starter, fuel should come out in a solid stream (not just a dribble)... if not replace the pump. If it does turn out to be the pump, check your oil for a gasoline smell as a faulty pump diaphragm can let oil into the crankcase. If so, change oil as well... Hope this helps...;-)
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