Small Engines (Lawn Mowers, etc.): craftsman lawn mower, craftsman lawn mower, briggs and stanton

Question
QUESTION: I have a craftsman Briggs and Stanton 6 hp, it was running fine then i decided to change the blade this is where it all goes down hill from here.  I then didn't think, and tipped the mower forward to lean it up against the fence to find the right size i needed to unscrew the blade bolt.  I went inside and forgot about it! 2 or 3 hours goes by and I then remembered it was still out there, when i went outside both tanks for the oil and gas were draining forwards and out the engine.  Now the engine wont start at all.  I am guessing that i flooded it, i took off the carburetor and cleaned it and changed the spark plug, and it still wont start... and ideas where to start next would be really appreciate.
thanks
-Tim

ANSWER: Getting the mower fired the first time might take some pulling.
First, the blade must be installed, and the bolt tight, for it to
start properly, as on push mowers, the blade helps act as the
flywheel.
  Next, the air filter may be oil fouled, and starting with it will flood the engine, so remove it, check it, and leave off until you get it started.

  The, when you have it back in the normal position, remove
the plug again, clean and dry it.  Pull the rope several times
with the plug out.  Check your oil level, top it off if needed.
Put the plug back in and try to start a few pulls with out priming or
choking, air filter still off.
  Then, if no chugs, try to choke or prime it, and see if you get
anything.
  Give this a try and get back.  If the filter is oil fouled,
there is no cleaning it if it is paper, foam can be washed and
dried, and a few drops of oil applied back.

Let me know,
 Fish

---------- FOLLOW-UP ----------

QUESTION: i tried it and it still wont start.
it feels like there is not combustion to start it do you think that that the piston is is filled with oil and it not creating no pressure to start it?  i don't know much but this is what im guessing any next ideas?
thanks
tim

Answer
Oil in the combustion chamber would make the rope real hard to pull,
so if it feels like you have no compression, then there must
be a problem.

   Just start from the beginning, did you hit something?  Is that
why you were changing the blade?

Was the mower running good before you change the blade?

Can you give me some model numbers off of the engine?

Let me know, thanks

Fish