You might be surprised how many don't get this and simply refuse to even give it a try .

BTW : with original rectifiers , the battery is always going dead because they " leak "  a tiny bit of current when the engiune is off .

-Nate
        Russman wrote:

 
+1, my experience has been that a good battery is what makes my 90 a one kick wonder, when the battery is weak, he gets hard to start and will begin to misfire at the top end.