DoctoRot wrote: you need 3 things for a bike to run, compression, spark, and fuel. You have verified compression, Can you verifiy spark and fuel?
To check spark, remove all the spark plugs. One at a time, insert them into the different spark plug wire boots and touch them to the engine so they ground. As you crank it over you should be able to see a fat blue spark.
Actually 4 things are needed to make an internal combustion engine run. You forgot oxygen. The fuel/air ratio needs to be somewhere around 14.7:1 for it to ignite. If the ratio is much over or under this ratio it will not fire. This is the reason that a electric fuel pump will work inside a fuel tank.. the fuel / air ratio is wayyyy too fat to ignite the fuel inside the tank.
The sequence is suck, squeeze, bang and blow. (intake, compress, ignite, exhaust) I had a T-shirt that said this once.. everyone thought it was a dirty meaning, but it actually described the 4 stroke internal combustion motor sequence of events.
A flooded or fuel starved engine will not run. If there is indeed fuel and spark there, it is most likely flooded. A shot of starting fluid into the intake air will tell you if it's fuel starved. If flooded, it will not fire on the either. Wet plugs will a not fire nor spark. The wet plug shunts the electric current to "ground" without sparking the gap.