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

[Cosmokenney]

I'll disagree with that it couldn't make it to the top of the piston . I've worked on a couple of other left kickers that start with M that the big end rod bearing was coming apart and collapsed the ring groove causing the ring to stick . I'm not saying this is your problem but I've seen it more than once . If you have ANY concerns as to what is happening pull the cylinder and check it out , as far as you already have it apart , why not . Buy the addition gaskets that you need to put it back together .

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.

 

[Up-tite]

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

 

[rockdancer]

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.

 

[Trenchcoat85]

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

 

[Cosmokenney]

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/topic/1248845-brand-new-damaged-husqvarna-cylinder/?utm_source=Trending&utm_medium=BulkMail&utm_content=Brand+new+damaged+Husqvarna+cylinder&utm_campaign=2017-12-19-450+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.

 

[Trenchcoat85]

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.

 

[Cosmokenney]

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.

 

[LandofMotards]

So...doesn't sound normal or shouldn't anyway...

 

[oldbikedude]

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!

 

[Cosmokenney]

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.