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A predisposition to one side or another would probably mean either a weight balance issue (like a phatail installation) or that the rear axle wasn't centered properly... unless your left foot is considerably larger than your right :P
It could be a number of things that can cause it.
If your still running the stock spoked frontwheel it might need the spokesto be trued up.
Your rear wheel can alsobe a very likely suspect,A rear wheel not properly aligned isone of the major causes of a bike pulling to one side or the other...
Uneven tire wear can also play a role.
I experienced this after the rear tire was replaced. I aligned the rear tire and presto, straight down the road with no hands (on a flat surface).
I found a website that suggested making a caliper out of a wire coat hanger to make sure both sides of the axle were the same distance from the center of the swingarm pivot bolt.
I like some of the other suggestions as well, but this is a simple place to start.
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