adrian, here are a few places to start. get a 6 volt battery charger. charge the battery and test it to see if it is holding juice. get a new spark plug. if it is, remove the old spark plug from the head, attach the new plug to the spark plug wire. kick the bike over to see if juice is getting to the spark plug. if you get spark, it should be a simple matter to get the enduro back running. if not, you have an electrical issue you´ll have to find and correct. if the gas tank is rusty, you should creem it. you can get a creem kit online or at your local cycle shop. just follow the directions. it´s not hard, but you must set aside a day and follow the instructions. did i say to follow the instructions? it works great if you do. if not you´ll have a mess to clean up. you may want to get a clymer repair manual. they´re available from clymer.com. next, remove the carb and clean it with carb cleaner. you can get carb cleaner at the auto parts store. get a new air cleaner. if your local yammy dealer doesn´t have one or offer to get you one, look online at nwvintage parts or speed&sport yamaha. once the creem cures in the gas tank, reinstall the gs tank. put fresh yamalube injector oil in the oil tank. put fresh 10-30 oil in the crankcase. put fresh gas in the gas tank. don´t use the stuff that´s been laying around in your lawnmower gas can. gas starts getting stale in 30 days. get fresh gas. put everything back together, start the ignition and kick away. if it was in decent runing condition before it was stored, it should come to life. if not, you´ll have to diagnose what´s wrong. fortunately these enduros are simple and pretty tough. so it shouldn´t be too hard to get it running again. once running, take a brief, slow test ride to check the transmission, clutch, brakes , lights, horn, and suspension to make sure it´s safe, functional and rideable as it sits. terry