I am trying to help my brother out with his 90hp yamaha engine. His engine will run good for a while then will start sputtering like it has lost a cylinder. He was getting a steady alarm. We determined that the alarm signified a probable overheat. We replaced the water pump and also found the thermostat was corroded and stuck closed so we installed a new thermostat as well. Thought it was fixed. We took it out this weekend and had same problem. No alarm sounded this time though. It also got to the point where engine would not even run. Got it home and started trouble shooting. We thought it was the thermo-switch so we jumpered it then tried to start engine. Starter engaged then quit. Now we get absolutly nothing. 20 amp fuse in main harness keeps blowing. Did we fry the CDI?
