1.) Typically plumbs into a fitting on the air intake box next to the carburetor.
2.) It just dangles and if you see gas coming out of it, your float system is not working right. The purpose of that line is so just in case your float isn't working right, the overflow of gas will go out that tube instead of filling up your cylinder...which is a bad thing.
3.) Sounds like a vent/breather. Need pic for confirmation.
4.) The cover for the fan you want. It creates the sealed system that is required for your self contained cooling system to work.
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