Today I put some Redex Fuel Injector Cleaner in my ninjette.
I've rode 1000+ miles so I felt maybe a bit of carbon or coating may have built up in the engine, and this stuff can't so any harm and is cheap so I gave it a go.
My ninjette seems to be pulling slightly better at lower rpm's, it starts a fraction easier from cold and runs better from cold, and feels less lean all-round.
Recommended!