Just removed carbs off 1977 GL1000 after years of seating. I noticed some liquid that smelled like gasoline or (and engine coolant). I am assuming that there will be a ring of rust inside cylinders (2 of them are full of that liquid).
My question is should I remove the cylinder head and clean them (change the gasket) or just suck that liquid and good to go?
First time working on this bike

Thnaks