A few months ago I had the boat out on a fishing trip and everything appeared in normal working order and good running condition. The following weekend I took my folks out on a fishing trip and things started to go wrong. <br /><br />At first it would bog and die out at WOT like it was starving for gas or something. When I tried to start the boat after drifting to a stop, it wouldn't crank over immediately, like it was seized up (battery cables felt hot too, but I assume this was from the starter struggling to turn the motor). After sitting there about 8 minutes scratching my head wondering what to do, I decided to try another crank, this time it started up fine. Got up on plane and started running about 3/4 throttle and it died out again. Once we got on plane again I was able to keep the boat at about 1/2 throttle without it dieing. We finally made it back to the doc.<br /><br />My fuel lines, bubble, and gas tank are in good condition, in fact, I had my dad pump the bubble when it was bogging out but it didn't seem to change anything. I rebuilt the carbs a while back and it had been running fine ever since. I even run the gas out after every use and put stabil in the tanks. I gave a trusty mechanic a call hoping for some help.<br /><br />The mechanic told me it sounded like the engine was "seizing up". He said the only way you could be certain was to pull the head and check for cylinder wall scarring and damage. I did this and found no deep scratches or anything else that looked out of shape per his description. I put the head back on and installed all new oil lines and check valves (oil injected) sine the originals were becoming decayed. <br /><br />Hoping that one of the oil lines was the problem for the engine seizing up, I decided to take it to the lake and give it a try. Got up on plane and still dies after a brief running period, just like before. In addition, I have this tapping or knocking sound that gets louder with engine rpm's. I can't figure out what it is, but the engine still runs strong until it dies out. I have the fly wheel off looking around because that is almost where the noise appears to be coming from. Oh, I told the mechanic what happened and he said he'd have to look at it in person, but I don't have much time to drag my boat an hour away just for a "look"<br /><br />Any help would be appreciated, I tryed to be as thorough and possible, and questions plz ask.
