Okay so I just recently rebuilt my blaster. I put all new bearings and did a full top/ bottom rebuild. A few days ago was riding 6th gear at about half throttle and it decided to start seizing up on me. It would run fine for a mile or two if you let it cool but as soon as it got hot it would seize up. Prior to this I noticed it was getting pretty hot, which is weird because I checked thoroughly for air leaks and there were none, so I didnt think much of it. It had also been making weird noise ever since I rebuilt it that I could not pinpoint. Kind of like a rattling noise coming from the engine at about 1/4 to 1/2 throttle. It would not make the noise if you revved it in neautral. I checked for any slop in the crank and connecting rod and there was none so I didnt think too much of that either. So any way heres pics of the piston exactly how it looked when I removed the cylinder minus the parts on top where I smudged the carbon with my finger. My question is what caused this amd the overheating/noise so I wont make this mistake again?