Thanks once again for all those replies and suggestion's. Now thinking on OS 1.40 certainly its way to much for the ship to handle.
I have short listed three options for my self:
1. Webra with wrap around header tune pipe.
2. OS 91 FX Engine with header tune pipe.
3. YS 110 with header tune pipe.
Have heared and compared that the YS 110 still is the best option as it has much more power than a 91 FX

. But havent compared between propellers as options to change and get the maximum output.
What will be your comments?[&:]