Lowering question

I just got my BRAND NEW wr250r this past sunday. I haven't had time to post pics because of work. I just have one question. I bought a Moose lowering "knuckle" to lower my bike. It will lower the seat height by 1.75''. Do I need to adjust the chain after I install it? The instructions don't mention anything about that. Thanks in advance.

If your chain is already adjusted properly, then no.

If the chain seems as tight as a bow string when you have the front sprocket shaft, swingarm pivot shaft, and rear axle aligned in a straight line, then yes. :)