How do you diagnose non starting issues on Fuel injected motorcycles?
Take the air cleaner off and spray starting fluid directly into the throttle body and start it. What's the fuel pressure? A bad fuel pump may be the problem. Now tell us you're out of gas!
Good post with actual information. Yuppers, could be the timing. Could be the ride-by-wire butterfly valve or stepper motor. Could be the throttle position sensor. Could be a busted / shorted wire somewhere. Could be no compression--a stuck exhaust valve. Compression's easy to check. Gotta be something to do with fuel, spark, or air, dude.
Compression test. Maybe a valve is stuck partly open. Or a cracked valve head or seat. Compression, fuel and timed spark it has to run!
You are overthinking. Check injector resistance. Check injector pulse with a noid light. Check injector voltage and current with a scope while cranking (disable spark). Or simply pull injector and check if it is spraying fuel. Injector could be bad. Injector checks ok, check fuel pressure with a gauge. The fuel pumps on these Chinese bikes fail often many mechanics do not even check. Pressure checks ok, check compression.
You are not a car mechanic by any means. You are a kid who bought a cheap chinese bike, pulled it to bits because you think you know something about engines and now it is dead. A car mechanic would not describe valve clearances as "advanced"