mulliganmagic
Petty Officer 3rd Class
- Joined
- Jan 9, 2004
- Messages
- 82
The last two trips out this motor has given a lot of trouble. It does have oil injection, but since we've heard that you can't trust the system we put 16 oz of oil into the 12 gallon tank to act as a back up incase the oil injection stopped working. So, the engine was recieving oil from the oil injection as well as from the gas tank. At the same time we also added brand new spark plugs from an auto store (NGK BU8H). I've heard bad things about auto store plugs anyone else heard this? Some people say to buy them from the boat dealer.<br /><br />Now what happened is the motor ran well for a few minutes, but then it started loosing power on and off. It would have more power some times more than others. But then it cleared up and we just descided to go along on a ride. The engine ran fine up to WOT at about 5500 and then backed down to about 4000 and after about 4 miles it started making a noise so I let off of the gas. Then when we tried to go it wouldn't idle well at all but it would rev with a different sound than normal. It took several minutes, but I finally got it to go. The engine would not bring the boat on plane. When I would try to give it gas it would shake and bogg. So I headed back to the boat ramp at about 1000 RPMs and it sounded like it was missing and the Tachometer hand would move while I held it at a steady throttle position. The fluctuation would be maybe about 100 RPMs. Then, after idling along at 1000 RPMs for about 1.5 miles it smoothed out and I gave it gas and it planed out and made it back, however the sound was slightly different than normal. <br /><br />We thought that the plugs had been fouled, so my grandfather put the old plugs back in it. It had always performed very well with these plugs. We also added 4 more gallons of gas to the tank to dilute the oil that we had added. Took it to the lake and it did the same thing again and maybe a little worse to boot. The motor was smoking very badly as well. Finally, the last thing that I notised is that 3 of the rubber covers over the power pack connections were melted located on the bottom of the power pack.<br /><br />Any suggestions or thoughts of what it might be would be appriciated.