Mine were both off enough that when the chain was at it's tightest, I'd have 3/4" of play, then at it's loosest, 1".

They both were noisy but I couldn't tell as far as motorized bike performance....just noisy!

These next few builds I will see what I can do (if needed) to center them better.

Also, I will be hard at work on a simple tensioner (spring loaded).

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If it ain't broke, and you mess with it long enough, it will be.