Could be tires or wheel alignment as well but before spending any money, check your bearing. If you're not sure how, watch this video from Ari Henning on youtube. It won't let me post a link because I'm new to the forum.
search "How To Check And Adjust Your Motorcycle Steering Head Bearings | MC GARAGE - Motorcyclist Magazine".
Yeah new tires and weights fixed this problem a long time ago thank god. Thanks though!
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