first is to check the fuel rack that runs through the fuel pump .. if it moves freely, thats good. ..
check the filters if it has any and clean if necessary .. or replace.
check decompression lever .. does it open exhaust valve so that you can turn motor through all 4 strokes fairly easily ...
crack open the fuel pump to fuel injectors line and spin the motor ... getting fuel leaking out --- i would hope so, but if not .. find out why.
i think there is more .. but ill stop here .. there is a check list here somewhere on the forum i think