Unfortunately that's all beyond my expertise. Like I said above my carb knowledge is limited to my lawn mowers where I just drop the bowl & clean it out. If you look at the pictures I posted this looks a lot more involved & I don't even know where to start to disassemble it.Even if it finally starts, I'd do a full carb clean and replace the fuel line(s). Five years is a long time to let gasoline just sit around, you likely have varnish buildup in all sorts of places.
Tearing down the carb isn't difficult. Just go slowly and keep track of all the parts. They key areas to clean will be the jets and the needle + seat. You can get carb cleaner spray which will help a lot. You should be able to see clearly and cleanly through all jets. Do NOT "clean" them by running a wire or drill bit through them, they will be damaged and then have to be replaced. Cleaning is fast and easy.
Also, unfortulately right now I'm battling an unbearable case of vertigo & I can barely even stand up so it's going to be at least a few days before I can look at it again.