2007 TRX420FM that won't start.

No FI light codes, all fuses good, and gas is good.

Temperature is 80*+ during tests.

Engine simply turns over during attempted starts. No backfires, no attempts to start. Compression is good. Wondering what could be wrong that would cause an engine getting spark, gas, and air not to start?

Not overly familiar with EFI four wheelers so any avenue to check would be helpful. Any common items on this model that typical go bad and would cause this issue?

Items checked and the result:

Fuel pump - primes correctly, pumps as engine is turned over

Spark plug - sparks when engine turned over, have not tried a new plug though

Fuel filter - clear

Fuel lines - clear

Fuel injector - sprays correctly with engine turning over

Air filter - not installed during the testing process, so not an issue

Thanks in advance for any help.

-Shannon