Hi Loco,
my outboard does not have a thermostat fitted or indeed a facility for a thermostat, that is why I was wondering how the engine could ever reach operating temp with cold water constantly "wizzing" through.
I just thought that by reducing the flow through the tell-tale I could perhaps allow the engine to run a little warmer as it does discharge alot of water through it, but on reflection maybe not as I could not regulate the discharge through the leg.
Looks like I will have to just accept it, as it was probably designed to be like that.
Thanks for your input