Squawking noise on and off

[His Dudeness]

Does the frequency of the noise change with speed? If so I'd be looking at rotating things like wheel bearings, speedo, brakes, chain and sprocket. If it's a bit more random and doesn't change with speed it might be rear suspension linkages, maybe swing arm bearings. Also I'd check the dreaded front sprocket nut. Your description is pretty vague, the problem could be anywhere, check the easiest things first but it's a good excuse to take the front and rear end off one at a time and  investigate and give everything a clean and grease.