TE/TC Could use an opinion on this cylinder scarring...

Right, I realized that after I posted, hence my edit. I've already put it back together and rode it. I may pop the bore scope in there again to see if it got worse. I do think you are right, though, I may just pull it apart for the winter and send it off for plating.

Just pull it apart, could have been chunk of carbon from top of piston between piston and cyl.
If lost pin clip would be big mess.
Later George

I had a similar mark on my 165 and I think was a minor sieze caused by heat . When I checked the ring end gap it was huge - I put a new ring on it. Id just ride it for another 20 hours and put a new piston and ring in it . If your worried do it now and clean out the bottom end.

I am pretty sure the drama is over. but I understand most people would pull everything and repair it.

looks like you're not the only one:
https://thumpertalk.com/forums/topi...7-12-19-450+thumper+vs+300+smoker+&trlv=26805

Thanks for this post. His scoring is in the same exact spot as mine. I was just about to start ordering top end parts. But after seeing this I'm starting to think I might not want to use a stock piston now. I should probably just wait and see what happens with that guy's attempt at a warranty. Mines a no go as I'm way past the 30 days. But maybe something will come of it, like a newer cylinder/piston combo.

Post a me-too picture with his thread possibly. Maybe KTM/Husky has some minor issue and might see the post.

also, take a mirror and put in one of the ports where the striation is- and see if the ring has scoring or if it was doing the damage. if you can get a view of the piston sidewall/skirt, take a look. (rings are hardest, cylinders are hard, pistons are soft)

you can wait- nothing more is gonna happen to your motor, I'm predicting. And maybe the other guy will get some satisfaction which will give you a path to take.

UPDATE: I contacted my dealer, who contacted Husky on my behalf. Husky says "it's normal for that scoring to be there on these bikes", and that I should just put in a new top end and run it. But they also said that since I can slightly feel the edge of the bigger mark, I should slightly hone it while doing the top end.

Sooo, Husky says it's normal, you should replace the top end and hone it? Sounds like not an answer at all. Great answer, not!

Yea, I'm not happy. I love this bike, but Husky doesn't care about little old me, it seems. If I were a race team manager, I'd probably have a new top end and cylinder in my hot little hands already.