Next door neighbor has a Honda 100 cc motorbike that would not start. Based on his description I concluded the carb was stopped up with decomposed, phase separated ethanol gas.
I was correct. That was absolutely the nastiest mess I have seen to date! Gooey, brown, thick syrup and watery slime, plugged jets, glued shut float valve and unknown stopped up passages. Spray carb cleaner, wire sprigs from a wire brush, small wire brush to remove scale and persistence aided by podcasts got everything (I hope) cleaned up. Maybe this morning it will be back on the bike before it gets too hot.
Honda, or Keihin used captive "O" rings on this carb instead of gaskets! Float bowl and intake manifold joints have thes and really speed things up!
More later...
