Small Engines (Lawn Mowers, etc.): 3.5 HP B&S lawn mower engine., lawn mower engine, hp

Question
Engine does not seem to be firing. Replaced plug and no help.  Getting plenty of gas.  Mower is approximately 4 years old.  Any thoughts and what is the best way to troubleshoot?
Thanks very much.

Answer
You need to check that it has spark.  If it doesn't, the problem is with the ignition module.  By "Getting plenty of gas", do you mean the plug is coming out wet?  If you have spark and the plug is wet, there is problem with the carb flooding the engine.  Let me know what you find.