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It sounds to me like a twin cylinder engine that is only running on one cylinder.

Start the engine and then, with a good set of insulated piers, pull one of the spark plug wires off and note how the engine runs.

If the engine dies, then you know that the other cylinder is not working.

If the engine runs the same, then the cylinder that you removed the plug wire from is not working.

If the engine stays running, but runs much worse than it did, then both cylinders are working.

What could cause one cylinder not to work?

1. Bad ignition coil

2. Valve rocker arm came loose. or bad valve.

3. Broken connecting rod on that side,.

4. BAd spark plug on that side.

5 Blown head gasket on that side.

AND

check the oil

does the OIL smell a bit like gasoline?

often when the floats stick, the gas will drain right into the engine oil in the crankcase thinning it greatly

then it can pass through everything

past the rings and piston, past the valve guides, through the oil pump

If the carburetor no longer is running the engine rich, then you need to change the oil if it smells like gas

but, usually engines do not have only ONE spark plug carbon up

unless they are running on one cylinder

Speaking of just the OIL

There are several things that can cause this.

I will try to list some of them for you.

1. If the carburetor is not working correctly, it will bypass fuel through it into the oil. This thins the oil and will cause the oil to go places that it shouldn't. Check your oil ans smell it to see if there is gas in the oil. If there is gas in the oil, you will have to overhaul and clean the carburetor with a COMPLETE carburetor repair kit.

2. If the oil dipstick gaskets are not sealing correctly, it will allow the vacuum.. (Primary compression inside the crankcase) to be at the wrong levels, which will push oil out where yours is coming from.

3. If the valve guides in the engine are worn, it will pressurize the crankcase...pushing the oil out.

4. If the engine had worn out rings or a scored piston, the it will also pressurize the crankcase and push the oil out. The engine will have to be overhauled if this is the problem.

5. If for some reason the engine is running too fast, it will also cause this problem. This happens is someone has messed with the governor to get it to run faster. Also if the governor gear has broken inside the engine this will also cause the engine to run too fast.

6. If you have a blown head gasket, this will also cause the problem. In fact, this is one of the first things I would check.

If you don't feel comfortable with this kind of repair I would suggest sending it to a reputable shop.

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