I'm with Denise on this one - keep looking.
The idea of a motorless existence may have some superficial attraction, but it sure wouldn't be for me. On the basis that, no matter how careful and well prepared you are, there is always that outside chance of ending up in a situation where the motor is going to save you from death or, even worse, a wrecked boat. The rest of the time, a motor just makes simple things like docking that much easier.
With a bit of patience, you should be able to find something you can fall in love with which also has a nice Yanmar, Volvo or Universal diesel to aid propulsion.
Leith (rhymes with teeth) is the port of the City of Edinburgh in Scotland. A Leither is someone who comes from that area.
I must go down to the sea again, to the lonely sea and the sky - I left my shoes and socks there, I wonder if they're dry?