Hey everyone I have something a bit unique. 2008 polaris RZR 800 with 2004 cbr600f4i engine. I do currently have a problem that's driving me crazy where it won't start.. I'll post it in the appropriate area but figured it couldn't hurt to say my problem here as well.

I have FI light 2, 8, and 9 which is map, tps, and iat. I checked the sensors and they all tested good and the wiring checked good leading to ECM.
Fuel pump primes, I have good spark although it seems a bit slow or maybe a bit weak.
I have pulled and cleaned injectors and they're all spraying good. And I have 50psi of fuel pressure. Only thing I haven't actually checked is compression or valve adjustment but compression seems strong.

My problem started out as being difficult to keep running and if I let it die out then it wouldn't start for like an hour. Then it got to the point of being difficult to start and if it would start it wouldn't rev above 2500 rpms. Now I'm at the point of no starting at all.