Today I was planning on taking apart the Passport to find out why the thing wouldn't run. After sleeping in until 9am, then putzing for an hour, I finally got around to it. First task was cleaning out the gas lines and installing an in-line fuel filter. Easy!
That done, I started the daunting task of taking out the gas tank (it's under the seat) and figuring out how to "derustify" it. After sitting for 25 years, the 1/2 tank of gasoline rusted the inside of the gas tank - leaving tiny pieces of rust floating in the fuel. I had previously consulted a local Honda dealer, and they said to use this 2-step solution to remove the rust chemically. The tank is currently soaking overnight - hopefully it'll work as intended, because it's about $150 to take it someplace and blast the inside of the tank out.
Then I took off the carburetor and cleaned out all the rust deposits. Did I mention it's really handy to have an air compressor? It is! I then taped up some exposed wiring (thanks to little mice who made this bike their home over the years) and put everything back together, minus the tank.