Posted by Phil T on 08/25/16 - 7:59 AM
#9
I recall that Yamaha sold 90/115 hp power heads to Mercury in the early 00's before their 4 stroke models came out. If yours is such, it is often referred to as a Mercaha.
The thermostat is straightforward
if you are mechanically inclined.
Do you have a shop manual? While OEM manuals are best, an aftermarket will suffice.