Cylinder markings on wall any ideas??
 

Anyone have an idea of what this marking could be from. It almost looks looked like a scrape mark but I think it feels raised? Can I get your guys advice??

Attachment 3290Attachment 3291

Which jug is that Trev? Any markings/damage to the rings or piston? Have you tried cleaning it up at all with some carb cleaner and scotchbright? Intake side so maybe something thats been pulled through the intake? Reed valve?

Sadly it's a ktm jug lol. I was just curious about ideas I thought maybe a chunk of carbon off the piston. I'm getting the boys at work to give it a quick hone so no biggie. Piston had markings to and bike ran like crap. I am trying to get it race ready for a buddy on Saturday. Should be all good but ill definetly have a peak at the reed block as well. Thanks bro!

Seen very similar in KTM 300 2011 cylinder, 100hrs.. first piston change, but it was exhaust side of cyl.

If its actually raised from the nikasil surface, its likely deposited aluminum from the piston.

How much can I hone it do you think before the nickasil will be to thin? I thought maybe half a thousand after looking at it

You can't actually hone away nikasil unless you have diamond hone. What they finish hone with after replating is a little different than your average flex hone that just deglazes. I'd start working it with some scotchbrite just in that area, you'll see results quick enough if its aluminum. Then just an even scotchbrite cleanup of the entire bore or a light hone deglaze. If nikasil is damaged then oh well you know what to do.

Roger that Glenn ill give the scotch brite a try thx

Trevor,

You cant hurt anything that way, it will only remove what is soft.

raised marking
 

You can remove deposited aluminum with acid. I have removed much worse, from melted down topends