OK....six months later, we did it!!! What an insane time it was . Started in Largs to Tarbert. Over night air b and b. Then down to Crinan. Then down Loch Fyne to a brewery at the bottom by Invarary. Over night there and up to Portavadie . Refuelled there , then down to Loch Ranza. Pint there. Then up the Kyles of Bute in the evening and Around to Rothesay. Again air Band B. Over night there. Then up Loch Striven (?) and back to Largs. 160 miles. 3 days. Brilliant. None of the script above does any of it justice. The weather was mixed but got better over the few days. Largs is great for launching. Tarbert is a simple marina with a few good restaurants. Inveraray has a very good crown hotel but no where to tie up rib. Jetty is very closed. Had to use my deep waders with the wife on my back to get ashore. Portavadie is a very impressive marina. We finished with the Kyles, at 9 at night. Water like glass...just great.
Observations..charplotter is indispensable.Charts are great for route planning in the pub. Using my dividers I measured the route before hand . It was 5% inaccurate. Yam 115 four with Delta 5.5. MPG 1 litre per kmile in the rough, 1.2 litres per kmile on average. Nice cruising speed 22knts. 4300 rpm. 17' prop is very handy as we were 4 up , 100litres of fuel and dry bags for four.
We have four individual tanks running into a manifold with individual taps. We set the Garman trip meter and changed tanks every 20 miles approx. worked great.
Thanks for the great advice all of you. If you want to know more just ask. Nik