I decided to put a smaller outboard on my tin boat [duratec/duranautic 14ft.] I had a mid 80's 35hp evinrude which runs great...it is just to much motor for the hull [never thought I'd say that......too much power] anyway I got a 1988 yamaha 15hp. which seems to be a perfect match. Motor runs very well but I felt it was running a little hot, you could hardly touch the heads while running. Checked out the thermostat first.....packed with sand, probably [maybe] original and quite salt encrusted. I go to the closest marina 3 miles away, ask the guy for a thermostat.....he hands me this little box, Yamaha printed all over it, and a gasket....he says 53.00 [????????] I politely/sarcastically say , oh , no thanks I just need one. He says yeah, 53.00. I couldn't believe it....t-stats for my 150 johnny are 32.00 for the pair. Whatever. Now it runs at a normal temp. This is my first yammie, I know they are good motors and I am quick to learn that parts are expensive. The Evinrude is up for sale. Anyone interested? Pull start, tiller arm, always maintained, owned it for almost 21 years, gently used, not abused. Good-very good overall cond runs nice.