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How do I test Fuel Injectors on a 12 KX250F?

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My bike just died out on the track, literally like pushing the kill switch. I have good spark, but not sure about fuel. I put 12V to the fuel pump and it seems to be working fine. Where do I go from there? i have never troubleshot a DFI system? Also Compression is low 50 PSI I am going to do a valve job and top end, But I doubt this is why the bike just died.

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You cannot test cylinder compression on motors that have auto-decompression systems for easy starting

50-70 psi is a typical measurement

 

There are several videos on youtube on testing FI system pumps and injectors

 

Note that a damaged  pump can work just fine for several minutes, and then overheat, so you have to test it for a bit.

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