My research has led me to the conclusion that you can use a Lithium battery in an ordinany modern motorcycle. That's why I've got Lithium on my Fazer, Hayabusa and B-King all without any problems. Provided your regulator is in good condition, i.e. max charging voltage 14.4v, you will not overcharge the Lithium battery. Get a Lithium battery charger though and fully charge the battery before installation and only use it again if the battery voltage gets below 12v on the bike, which should only happen if you've got poorly fitted electrical accessories, BTW the fully charged voltage of a Lithium battery is 13.2v. The only caveat to this is a Lithium battery voltage will drop quicker than lead-acid if you have starting problems and need to crank the starter for longer than normal.