Thankyou for that Daver, I know that when I flip mine there is a noticeable difference between it and other fourstrokes, same with my 1.50. My 1.50 is a very early version being a black engine with chrome rocker covers, I seem to remember that a couple of engine testers in the early ninetys rated them at 14.4 and 15.6 to 1 cr. I know that both will start on Davis Diesel fuel with no heat applied where as my .56 will start on the Diesel fuel with glow heat but quits as soon as its removed.