I have a taotao 110 atv we bought two years ago. My brother was riding it and revved it up real high and it backfired. It hasnt ran since. I replaced the carburetor, new spark plug, its getting fuel. It turns over but refuses to fire. Starter fluid doesnt work, starter checked out fine. I have no idea what else to do. Any suggestions welcome!

 

Check for spark and compression.

 

It has spark and compression.

 

Did you test compression with a gauge or just a finger over the spark plug hole? I just had a motor that would pop your finger off the hole when cranked, but only ended up having 50psi when I put a gauge on it.