I have a question about thermostats on my 90 Johnson GT200. I am still having a issue with a high end mis and sometimes lack of power. I finally got some time away from work today and pulled the thermostats out to take a look at them. After pulling them out I found one that was broken. See attached pic.


I looked up the thermostats and looks like you can get the assembly part #104,, 0394409. but I also see a thermostat cap listed (0330273 part $48) listed and don't see them in the engine. What is the purpose of the cap?Does it just act as a washer for sealing? The valve seat is in there (0320880 part #49). I am also going to order the thermostat diaphragm (part#0394408 part # 45) Is there a reason someone would have taken them out? Also could this explain the high end mis and lack of power I have been experiencing?