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I have a ‘99 yamaha vmax 150 2 stroke fuel injected auto oil mix. I recently had an issue where I was cruising around 3200 rpms and the engine buzzer would go off and degrade the engine. It happened twice the first day and then the second day ,after an hour of running normal, it wouldn’t let me get above idle or the engine would degrade. I had to get get back to the dock on *****ing motor in the dark, not fun. After inspection in the day light, I found that the oil reservoir under the cowling was low and not refilling from the hatch oil tank. Using the emergency fill switch on the back of the power head, I found that the pump was running on the hatch tank but still not filling. Come to find out, the small inline oil filter on the oil line from the hatch tank was completely clogged. $16.95 and it was fixed, so I thought... I took the boat back on the water to run it and it will run great for about an hour, then the buzzer will go off and the engine will degrade. After I pull it back to idle for 5 min then the buzzer will go off and I can continue to run normally until the next time the buzzer decides to go off (about 30min- hour). That filter was definitely one problem idk if this is related or another issue. I immediately checked the cowling oil reservoir and the oil level was full unlike the last time. I have replaced the water pump, thermostates in the last 2 months. I have a temperature gauge and a water pressure gauge which both look great when running the 3200 rpm. Low temp and 25psi pressure. Only thing I can think of is a faulty reading from a temp sensor that’s sending me a false temp on the gauge? Or a faulty oil level sensor? Any ideas? Any help would be much appreciated. Thanks guys