This is a 2000 90HP without the auto oil dispense.
I bought this boat last week and the previous owner picked me up at a different ramp than which he launched and so I was not exposed to how good the boat starts.
I drove the boat and she sounded great shifted strong fwd and rev.
Day before yesterday I took it out and was a little hard to get to stay running when I put it in gear. But finally got it to stay running after 20 min of running it up and trying to put in gear. Once started ran great!
Next day I took it out but on the way to the lake i put in 6gals of mid grade fuel, 16 oz of pennzoil 2 stroke oil which is 50:1 mix according to the bottle. Got to the lake and was again hard to get to stay running. But finally again after 20 min she ran. So I go to take off across the lake got it up to about 40mph and after about 10 seconds at that speed she starts knocking and then dies. I just fired it up and idled back to the ramp. No reduction in power but the knocking became louder the more power I gave so I just idled back and then hand loaded the boat took it to the shop and it could be daysssss before they get to my boat. Does anyone have ANY idea of what it might be?