Last fall I purchased a 1990 Crestliner aluminum fishing boat powered by a 1989 DT115.The boat sat for 3-4 years prior to my purchase. It was parked uncovered with the drain plug in. I was told the boat had carb issues and was parked due to lack of funds to fix. Before buying I performed a compression check and found 132,134,135,137 compression with NO spark on any cylinder. Root cause of no spark was a bad CDI unit. CDI box from 1990 DT115 was installed and engine fired up immediately. Still may have carb issues, have only tested on the hose. The boat has the Suzuki Caution System for oil level/oil flow/over rev/cooling water. Problem is I cannot find a warning buzzer for the system anywhere. The entire boat was gutted , including foam, so I definately did not overlook it. I pulled the float system out of the tank(simulate empty) and the bottom green oil indicator stays green but no red oil light is activated as per owners manual. In essence I can run this motor out of oil and not get a warning. Tried float system from the junk motor and achieved same results. Is it possible that someone electrically bypassed the warning system and removed the buzzer? I have NOT tried to induce other warnings to see if any of them work. Does anyone know where the buzzer is physically located? Also, could the CDI unit from the 1990 unit be bad or incompatable with the 1989 motor. Although ALL plugs/wires were exactly the same the CDI units from 1989 and 1990 have different part numbers. As a precaution I am running a 50:1 premix along with the oil injection. Any advice would be appreciated.