2002 CR125/134 'localized pitting' in cylinder...normal?

I would be concerned if they showed up after the plating process, means the Nikasil is coming off. If they were visible during the plating process then I would say they are acceptable porosity pits. See the Millennium video, they deal with it daily.

https://www.millennium-tech.net/vidplayer.php?id=34

Thanks. I researched the porosity pitting last night, and I agree with you.
Just seemed weird that it is so localized.
I didn't own the bike when the work was done, so I'll just use this as my baseline I guess.
I appreciate the response.

They almost look like someone was doing some port work and the grinder got away from them and hit the cylinder, kind of hard to tell in the pictures.

Does the cylinder look like it has a sleeve in it???

Definitely looks sleeved... take a small magnet to the edge easiest way to know...

DAMMIT....

Yup...forgot all about that way to check....

Definitely sleeved.

Buyer beware. Do complete engine teardown when buying a used bike...haha.
Funny the shop did a 134 kit on it...

dkurtd wrote:

They almost look like someone was doing some port work and the grinder got away from them and hit the cylinder, kind of hard to tell in the pictures.

Yup, that looks like carbide bur marks to me.......

Yup. Thanks Tracktor.
On top of all that, I've determined it's a sleeved cylinder.
Was not expecting that when I popped the head off.
Surprise, surprise, surprise...