i use amsoil 75w90- i also "flushed" the diff with some brake parts cleaner before the refill. there's lots of partical matter to rinse out. and as some members have cautioned, take care when you retorgue the plugs.
Thanks Jeff I already changed oil last weekend and filled till it ran out filler plug in the upright position, just wanted to be sure. I appreciate your help putting my mind at ease, now I can go for an early Saturday morning ride. Cheers.