I'm looking for easier cranking for those times when the bike sits outside all day and it's 30 degrees.
As far as 40 or 50, I think 40 would suffice for every month for my use except I prefer a 50 in July and August.
Now thinking about that, maybe Mobil 1 10w40 would be the best choice to use year-round. I wonder if there is any difference other than viscosity between their 10w40 motorcycle and 20w50v-twin oil. Maybe I'll call them and ask unless someone here knows.