I run 10w40 Kawasaki oil in my 800 and 1700 Voyager year round, and ride year round with temps getting down to around 20f in the winter to 100 and above in the summer. The only time I've ever heard a clicking in my 800 is on near red line shifts from 1st to 2nd, its more like as if it didnt shift completely. Possibly a bent shift fork.