i am new to this forum game but not new to motors. i have a problem with a 200 ocean pro evionrude i just got.i will make this quick and if i get feedback i will go futher. my problem is i have used this boat about 8-10 hrs so far and it is starting to develop a knocking noise. i am familiar with several types of motor including 2 strokes. when it started it sounded to me as if a large piece of carbon got stuck on top of a piston and was hitting the head.it is very hard to tell exactly where the noise is coming from but it sounded like one of the top cyl, on the head side. i pulled the heads and found what i thought was a clean spot where the contact was. i cleaned it, checked the cyls and put it back. the noise is still there. this noise is pretty loud even a untrained ear can here it. second guess is piston skirt slap but i would like some opinions before i take the motor apart. it has been running about 3 hrs with this noise at about 4400 rpms. it is not getting any louder but it is not getting any better. i think if it were a rod knock it wouldnt have made it this long. i will take the lower unit off and run it to eliminate it later this week. can anyone offer any suggestions or knowledge about the particulars of this motor. anything will help before i strip it down. thanks steve
