Small Engines (Lawn Mowers, etc.): B&S 5hp Enginer will not start., enginer, gas tank


Question
Hello fellow Kentuckian! I hope you can help me out.  I have a B&S 5hp engine that is being used on a pressure washer and it will not start. Here is the engine model and code:

10T502-E1 06052554

This is only 2 years old and it has been used for only 25 hours!!! It was winterized but for the life of me, I can not get this thing started.  I changed the spark plug and gapped to .030. The spark is good but that had no change. I emptied the gas tank, which has zero debris, cleaned it anyway and let it sit overnight to dry. No change. I let the carb soak over night in a gunk solution but that did not change things. I purchased a new carb thinking it was not getting gas and tried again with no luck.  It tries to fire if I spray start fluid in the carb but dies immediately. I completely disassembled the engine (never opened the block to check the crank and did not remove the pistons or valves ). I stroked the engine by hand and both valves are moving so they are not stuck. The bore is perfect around the piston and it moves freely. I re-assembled the motor and it still will not start. I am at a total loss here. There is not any oil leaking anywhere so the gaskets are good. Could the breather be bad or something clogged in the fuel line?

So, here is the simple run down:

New air filter
New plug and have good spark
New carb and bulb is primed with gas
Cleaned gas tank and engine inside and out
Fresh gas
Fresh SAE 30 Oil

I hope this is enough information and will provide more if needed! Heck, I might even see you at the Derby =D Thanks for your time and help.

Kevin

Answer
I now live just south of Bardstown, and never have been to the Derby,
always wanted to go.
   I had a small pressure washer that acted "squirrelly" last year,
it turned out to be a bad coil, which is odd for someting without electric start.
   Take off the pull starter again, and look at the coil, see
if it has a lot of rust, a bad ground could cause problems.  Remove
the kill wire to the coil.  While you are in there, remove the flywheel nut and make sure the key is not sheared, and when putting it back on, make sure you torque the nut down tight, or it will
shear soon.
Then if all else checks out, try to start with the "kill" wire
off and see what happens, if it starts, you will have to kill
it with pulling the plug wire.
   If it is anything like the little pressure washer I had last year,
it didn't have an unloader valve, you had to squeeze the water
gun to start it, the pump pressure was rough, so the sheared key
theory is a good one.
Sorry about the rambling response, just throwing these ideas all
out like a shotgun, maybe one of them will hit the problem.
Let me know what you find, or just call me, I live officially in Loretto.

  Fish