how old is the battery,, you should get yourself (optimate battery optimiser) you can plug the bike in , over night, and allways have full power, i have two bikes running of them , and allways start, check that the wireing on any cable run that you can see is not bare and hitting of the frame/body anywere..
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix motorcycles.