Reply To: 1975 Johnson 15R75C 15 hp

[Dale]

Buccaneer wrote:

Don wrote:

These things definitely have thermostats, and I would absolutely replace it if it is missing.  Won’t idle worth a darn without warming up and will foul plugs.

Be careful, there are two different styles of heads you might find on this thing, each has its own unique gasket.  Post a picture of the head and I will get you the gasket part number.   These thermostats are a pain to replace, but it can be done, am guessing this has not been used in salt water.

I watched the video, seemed to run OK, your mixture adjustment seems right.

Fleetwin, I guess I better look at the parts diagram, as I didn’t
see anything atop the head or block that looked to be hiding
a thermostat. Thanks!

P.S.- What do you know about those plastic gas tank cap’s
venting or pressure relief systems?

Buc on my ’74, the thermostat was at the bottom of the head.   Not the best thinking in my opinion.  My motor is gone now and I can say good reddens!

dale