Universal M18 Power Loss
Some history before I get to the problem. Bought an Ericson 30+ last year and had to motor sail up the Jersey coast for 8hrs. After about 5hrs. running the engine a Universal M18 it seemed to power down but never stopped. We throttled back to idle for a few minutes and it worked fine to our destination.
Fast forward to this weekend. First time for a long run with engine. Our destination was a 10 hr. run. After about 7 hrs. then engine lost power and slowed down( same as last year). Any suggestions on where to start to correct the problem?