Something i've done for cars is soak them in acetone then hot wire them open and blow them out with a compressor, then repeat until no more gunk comes out
I remember reading a few years back about 1 guy getting some injectors for a Ltd Ed cleaned/rebuilt at a diesel shop. Mine were pretty gummed up from the bike setting for 7 years. Once I got the bike fired up I ran Gunk fuel injector cleaner in her for about 2 months at twice the recomended ratio and she went from having a bad miss to running like a top!
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