I've got approximately 8 tanks heat cycled through my .28. I've been breaking it down every couple of tanks to make sure everything is wearing well (which it was). So this weekend I decided to take it out for it's first bit of track time. I'm running Nitrotane 30% using an OS P-3 plug with my head shimmed at .5. I chased a tune for the first part of the morning, but I believe it was because the outside temp was rising so fast. The outside temp stabilized around noon at about 90 degrees and I was able to finally get a proper tune.
Good news first: The power delivery for a .28 is as smooth as it gets! It wasn’t overpowering and I didn't feel like it would get away from me as I opened her up. I was definitely happy with the power delivery and this is my first .28
Bad news: Take a look at the pics showing both sides of the piston. I broke it down this morning to see how everything looked and this is what I found on the exhaust port side of the piston. The cylinder is showing wear in the exact same place but I can't get a good pic of that area.
Not sure what my warranty options are here, but I hope I'm able to get the piston and cylinder replaced. It had to happen at the track this weekend because I had it taken apart Friday night and everything looked great.
Any ideas or opinions on what could have caused this?