Small Engines (Lawn Mowers, etc.): Snowblower Problem, tap tank, internal passages

Question
My parents just gave me their snowblower which was in good working condition.  I had a problem starting it, so I replaced the spark plug.  I still have a problem starting it, unless I unplug the spark plug and spray starter fluid  in.  Then it's easy to start, but it only runs for about a minute (it sounds good) with some pretty smokey exhaust.  Any ideas?

Answer
Because it will only run with a squirt of fuel, there is a blockage inside the carb.  The smoke is likely from whatever starter fluid you are using (unless the oil level is way too high)  You will need to remove the float bowl and use a peice of tag wire to push through all of the internal passages.  Then follow up with carb cleaner.  It would be a good idea to clean the entire fuel system as well (filter screen in fuel tap, tank, lines, etc.)  The initial settings for the mixture screws (bottom of float bowl and into carb body above float bowl casting detail) is around 1 1/4 - 1 1/2 turns out from lightly seated.  The third screw (not going into the carb body) is for the idle speed.  Hope this helps.