Which is the compression ring??

[jbag]

I've searched.
'84 XR250R
Bike is all original and smoked pretty bad (I'm the 2nd owner).
I finally tore it down and mic'd everything.
New std. piston and rings going back in.
Which is the compression ring and which is the 2nd (scraper)ring?
1 is a shiny brass/copper color and the other is black/gray like the 2 lil' one's on either side of the oil ring.
I'm assuming the shinier one is the top comp. ring? But...NEVER ASSUME!!!
Thanks in advance,
jonny

 

[Rich Rohrich]

You have it correct. The black ring is the second/scraper ring. It's important to install it with the correct side facing up towards the head. It should be marked so you know which end is up, usually with a letter stamped on the ring.

 

[jbag]

You have it correct. The black ring is the second/scraper ring. It's important to install it with the correct side facing up towards the head. It should be marked so you know which end is up, usually with a letter stamped on the ring.

Thanks.
That's what I assumed.
Yup on the letters in the UP position.
8-)