My honda 400ex has spark and plenty of fuel but won't start why?

My honda 400ex has spark and plenty of fuel but won't start why? Someone help?!

Make sure fuel is getting into carburettor. IF so, make sure it's going into the Pilot Jet.

You can test this via attempting to start the bike, then remove the spark plug. The plug should be wet with fuel, if it's not, then no fuel is getting through. Most likely case is a clogged Pilot Jet and/or Passage. Blow both out with air.

Also make sure plug is gapped correctly for a good spark, blue / purple in colour is what you're looking for.

Always give year, make and model #
Sometimes the year can make a difference.

You say it has fuel.
That is what is in the tank.
You don't know what kind of crud is sitting in the carburetor's float bowl.

Untreated fuel goes bad in a few months leaving behind a sticky goo like substance.
That bad fuel clogs the jets in the carburetor.
Clean the carburetor.

From the beginning the infernal combustion engine has always required. 1) a corect atomized mixture of fuel and oxygen 2) an ignition spark at the correct time and 3) enough "seal" to compress the mixture of fuel and oxygen. Nothing has changed

Will need more info for a better guess.
Does it crank over quick? A dying battery has power being sucked out just turning On the key, meaning less juice to the spark plug.
As for fuel, are you turning Off the petcock after riding? Too much fuel can seep by and slightly flood the cylinder, so too much fuel to spark-off.

Strter. Battery.

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