I was riding my bike and it kept losing power then died. I started checking and all 4 cylinders have weak spark. the battery is charged and the plugs are brand new. Any ideas?

 

How did you determine you had weak spark? Are your plugs in tight? Are they gapped correctly? Are the wires connected properly? You should feel them almost "click" once they seat onto the plugs. Your bike kept loosing power until it died? Did you smell fuel? Is this a new condition since you installed new plugs? Any number of things could cause your symptoms. What have you done in between the time the bike ran good and it began to run bad? Have you checked for kinked fuel and tank breather lines?

Those are the areas I would check first if it were me.

 

fixed!