Bel Ray says the oil will never degrade in the gas, but the gas itself will. This goes against the KX manual that says that the lubricity will rapidly decline in pre-mix.
I would like to ask kaw corp. why their manual contradicts what Belray says about 2 stroke pre-mix.
I think the manual just does not want you to use old gas with water in it or unshaken pre-mix?
What I do if I have some as old as yours is add/combine some fresh gas and Bel Ray with the old mixture to freshen it up.
I hear old gas will turn to varnish and gum, but I have never seen it happen, except in the float bowl of an ancient carburator.
Maybe you can ask Kaw as I just asked prinmarily out of curiosity.