drain the gas tank completely with the petcock on reserve - DONT crank it over with old gas in the tank, you will suck a pound of jello into your carbs.
Look in there with a flashlight and see if the tank if full of rust. It it was kept full it should be ok.
If its full of rust you will have to do the rusty gas tank procedure, replace the fuel filter, probably pull the petcock off and clean its strainer
If there is no rust then get a bottle of Seafoam or another fuel additive carb cleaner and use it with the new tank of gas
If it starts up it might run a bit rough for a hundred miles or so, but if it will run the carb cleaner should be able to do its job.
EDIT: should add, if the battery has been kept on a tender all these years it might still be holding a charge, but be aware: with electronic ignition if the battery is weak it might be able to spin the starter, maybe a bit slow, but if the battery voltage drops below about 10V the electronic ignition wont fire the plugs at all.
So... if you charge up the old battery and it cranks but wont start, either put a volt meter on the battery while its cranking and make sure its holding up around 12V, or just get a new battery.
They last about 4 years under normal use. A five year old (or more) battery is most likely shot, unless it was a very expensive lithium Ion or some other type of "performance" battery.
You can find an OEM rated battery online for about $35 with free shipping (battery shark is a good place to start).
Last edited by KCW; 05-27-2019 at 01:29 PM.