New chain and sprocket?

[fazersharp]

So wd40 sounds like what I need. I only do max 100 miles in a blat out and all dry dusty, so a quick spray with wd40 will wash off grit then most will evaporate leaving a clean washed/ slightly lubed chain with nothing to fling. At the minute after applying gear oil the first 70 miles i am almost reluctant to lean over too much  :eek