Might not be a bearing.
After I took my 17/44 kit off [after 25,000 mi] the wear on the back of the front sprocket kind of explained the clunking I had been hearing from the chain, and made me think I should have installed the sprocket with numbers facing away from me, ie, into the engine, so that the wider shoulder would have moved the sprocket out, more in line with where the chain seemed to want to be.
The number-out installation of the sprocket put the narrow sprocket shoulder in, and the wider one out.
I made the same mistake thinking the wider shoulder was to face inwards. This was probably the reason why my last chain from the 17/44 kit exploded, along with extreme abuse on my end. The pins all sheared off on one side of the chain, indicating that the alignment wasn't proper. I'm pretty sure that I learned in my last phonecall to kyleracing that the wider shoulder faces away from the bike.
Also, because the chain sat further out, it wasn't properly encased by the metal chain gaurd the front sprocket sits it, allowing my chain to whip into my waterpump and take that out.
Lessons learned hard are lessons learned well I say. Also, I've learned that as chains get older or if they are dry, especially both, they are loud even if aligned properly.
BTW, take everything I say with a grain of salt because I'm one of the few people who actually managed to make a high end chain go boom, i could be wrong still