How does my cylinder look?

[kott0n]

Hey guys

I got a 1989 CR500 in a '06 crf250 beer can that I recently replaced the header o rings on and took a look at the cylinder. It runs great, doesn't feel down on power at all. I see no signs of detonation, the piston wash looks good but I see some dark lines on the wall. The hatching still looks good but these are concerning. They don't seem deep at all but I thought I would ask what you guys think?

Thanks!

[Rhino89523]

I'm not sure if it is just how close the picture was taken but it looks rougher than I am used to seeing but I don't look at them through a magnifying glass and that may be the perspective these pictures were taken. I can see cross hatching for sure but they look kind of ball hone style deep...may just be the picture.

[blownbillybob]

Sometimes they look rougher then they really are??

Scratches in the cylinder wall are normal. I would rather see some then none!!

I would be more worried about the bridge???



Rhino. Was up!!! Hope all is good!!!
Holding down the fort!!!

[kott0n]

Does the bridge look off? The bridge is the divider you can see in the pic that divides the exhaust outlet, right?

Thank you

[dbur]

It's the cylinder side of the bridge you need to look at. The bridge is supposed to have a bit more clearance than the rest of the cylinder since it gets hotter and experiences different thermal expansion.

[dbur]

blownbillybob , if you are watching this thread, I've been trying to get in touch with you to talk about some cylinder work.