Motorcycle Repair: Electrical problem could use some expert help, carbon brushes, carbon powder

Question
I have a 1984 700 ltd Kawasaki, It was my dads old bike it has set for a very long time. I started to work on it and have came across this problem when I try to start it all that comes I get is a buzzing sound It sounds like a weak battery but its not I even replaced the starting solinoid and I am still getting the same problem. If you would not mind giving me your thoughts I would appriciate it Oh it just started doing this it didnt allways thanx jason

Answer
Hi Jason,

When you press the starter button, you hear a buzz noise? Does this noise sound as if it's climbing in pitch until it reaches max rpm (kinda like a siren, but different tone), then drops back down?

I suspect the starter needs disassembled and cleaned. Carbon brushes insde the starter wear and the result is carbon powder build-up. The powder has nowhere to go and causes problems in time.

Advise and we'll go from here.

Mark