What Makes A Model 287707 14.5hp Briggs And Stration Engine Not Crank Of Difficulty Cranking Pass The Compression Stroke.?

There are a number of possibilities that could cause this. For instance, there may be too much oil, or there may be too much gas in the crankcase, which lets it get above the piston. If this happens then you need to remove the spark plug and ground plug wire that you don’t get a spark, as this would be dangerous if there is gas. You then need to crank it over and see if anything blows out of the plug hole in front of you.

If, however, it still cranks hard them something inside the engine will be partially seized. Remember too that it could be possible that the start gear is stuck into the ring gear on the fly wheel. If this is the case then it needs a new starter drive gear assembly.

When it comes to problems with your vehicle, you are faced with a number of opportunities. First of all, you can try and fix the problem yourself. By using the information above you can try and mend the problem. It’s only advisable to do this, however, if you’re already comfortable with fixing things like this on your own. If you have no experience at all then it’s not quite as good an idea to go ahead with it. This is simply due to the fact that you could cause more problems due to the vehicle, or you could even hurt yourself.

If you have no experience at all then go and see your mechanic. Your mechanic will be more than happy to look at the problem and see what can be done, as they will already be used to how your particular kind of vehicle works. You’ll obviously need to pay them a fee, but that’s better than chancing hurting yourself or damaging your vehicle even more.

I'm having a carb problem seems to be common huh?  I have to shut of the fuel before shutting down the tractor to make sure that there is now fuel in the line.  If I leave the fuel on all gas in the tank finds it's way to the motor.  But lately when I actually get it started it's covering itself in a blanket of white smoke than starts spitting fuel out of the intake... I thought this was just a common flood so I left the plug out and let it sit for about a week to make sure it was dry went out today to try and mow my land and the intake geysered fuel and the tractor chuffed smoke and a fine mist of oil and fuel came out the turning part of the motor

any ideas

Several possibilities, too much oil or gas in crankcase letting it get above piston.  Remove spark plug and ground plug wire so you don't get a spark if it would happen to be gas, then crank it over and see if anything blows out of plug hole.  If it still cranks hard something inside engine is partially seized.  
Another possibility is if the starter gear is stuck into the ring gear on flywheel.  If so it needs a new starter drive gear assembly.

My briggs has a fiber gear on the fly wheel with several teeth missing so I took an alluminum one and attached it to the flywheel and it works ok but sounds like it is way out of time does loud back firing and never runs,any ideas?