I have a 95 model 75hp mariner outboard that I just can't seem to figure out. When I got the boat about 4 months ago it had been sitting a while so I changed foot oil cleaned carb jets and changed spark plugs. It ran great for about 3 months. It runs around 40 mph wot and has great hole shot when it is running right. About a month ago I put it in the water and went to take off and with the throttle wide open it was running very rough and shaking really bad almost sounded like a miss. It would run about 19mph that night. Well I turned around immediately and put it on the trailer. Next day I checked compression it read perfect. I also checked prop hub it is good. I also checked spark and fuel system. I ended up changing both in line fuel filter and fuel water separator. Took it to the water that day and it ran the same that day for a little while then it picked up and ran perfect for about a mile then started the rough running stuff again. So I put it on the trailer. at this point i thought i had bad fuel r water in my fuel system. So i emptied my tank drained carbs etc. and took it back out and it ran wonderful except for about 30 seconds it acted up. But the rest of the trip it ran great. Well next trip i lost all hole shot and top end didnt even act like it was missing or running rough i just had a lose of power. and it has been the same since. Today i changed powerpack and it is no better. I also went from oil injection to pre mix also didnt make a difference. Also changed plugs and no better. I also ohmed out the stator and it is within tolerance. I also today found the gas line that runs from the top carb to the fuel enrichment solnoid valve was eaten up from the inside out. So i replaced it and cleaned the valve out and recleaned the carbs and it also had no affect on my problem.
So my question where should i look next? Thanks so much in advance.
So my question where should i look next? Thanks so much in advance.