my gpz500s will not fire?

Cheapest first.Get somone to give you a jump start.if starter engages and starts battery's flat.check voltage at bat with multimeter,minimum is13.5 volts,if less than13volts battery's flat due to fault in alternator/regulator/rectifier..if jump start fails to spin and engage starter then starter motor is faulty.All this presupposes that all battery clamps are clean and tight and all earths are same

caine
July 2008