Small Engines (Lawn Mowers, etc.): 3.5Hp Tecumseh Lawn Mower Engine, engine numbers, fuel flow

Question
Dear Michael,
I found a 3.5hp Tecumseh Engine on a mower body. The engine numbers(model) were taken off some how. Im sure the engine is between 1997 and 1999.
So I tried starting the engine and it does start but only once every 10 starting attempts though, and when it does start it will only run for about 30 seconds. I tried cleaning the filter and changing the spark plug. I also made sure that gas was getting to the engine because the spark plug appeared to be wet. There is a broken  carbuerator gasket also. Please see if you can help me.

Answer
Hi Mike,

Where is the broken carb gasket?  In the carb or between it and the engine?  It should be replaced and is most likely causing a problem.  Maybe the only problem.  
Even though the plug is wet, the engine may be getting fuel intermittantly.  
Hard start, trouble shooting:  You will need to determine if the problem is a lack of spark or a lack of fuel flow.  Right after it quits, remove the spark plug, reconnect the wire and lay it against the engine head.  Pull the engine over and watch for spark at the plug's electrode.
If good, then try to start while squirting fuel or starting fluid into the carb intake.  If it starts, then the carb most likely has dirt, debris, gummed fuel or water inside.  You will need to remove the carb, disassemble it, clean all the small internal openings and blow it out with compressed air.   Probe each and every hole with a small wire.  A carb rebuild kit wouldn't hurt either.

Let me know how you make out.
Michael