Wally,
Buy the Mercury manual for your motor from WM. It's always nice to have their 
insight.
We had one of the best days sailing yesterday that we've seen on our lake in 
August. It was hazy cloudy, not to hot and great winds.
I also had an opportunity to sail side by side with a R22 with the standard 
main and a 175. I know everyone wants to know what happened, but I'm not going 
to tell you. :)

Rummy