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the methanol in the fuel is an alcohol solvent that will re-dissolve the gummed up oils back into the fuel while still being safe for everything in the engine. obviously dont use fuel that has absorbed a bunch of moisture, and flush it out once done. definitely re-oil with an ARO of choice...

agreed, wd40 is not a good after run oil (IMO, some people swear by it though), nor lubricant, but it does act as a solvent and will help to break up gummed up oil. the castor oil to keep it from gumming up, and keeping the internals clean though, i do not agree with.

it "could", but hard to know for sure without looking until its too late. the engines are really simple to remove and to open up. as long as you have a clean work surface, and dont use metal tooling internally, it would be difficult to mess them up. just few things that are good practice is to...

as Cbaker said above, really recommend taking off the backplate and rinsing it out. whether with old nitro fuel or WD40, brake cleaner (non chlorinated only) Denatured alcohol, etc. make sure if you do use a cleaner (denatured alcohol, brake cleaner, etc) to re-lube the piston and sleeve and...