webbie
XS650 Member
Hi all, I know from a forum search that piston rings are the source of some confusion - e.g. installation order, the fit of various brands, etc.
I'm rebuilding my '82 with a set of Cruzinimage pistons, 447 type, 1mm oversize.
I understand that stock rings will be stamped with "R##" to differentiate the compression and wiper rings. I also understand that the compression and wiper rings are different thicknesses, and should only fit in the correct order.
However, that's not the case with these. The two thickest rings are stamped with "STD," and appear to have identical thicknesses - both rings fit into both grooves, regardless of the order (see pics).
The rings are differentiated on the following base:
Ring #1: Silver (chrome) finish on the outer edge. Beveled on the outer edge.
Ring #2: All black. Appears to have a perfectly rectangular cross section.
From what I've learned, I THINK the chrome-plated + beveled ring is the top compression ring, but I wanted to make sure I'm not off-base. Can anybody confirm the installation order for the rings that ship with the Cruzinimage pistons?
Stamped with "STD"
Chrome plated on left, black finish (cast iron?) on right
Rings fit in grooves in either order
I'm rebuilding my '82 with a set of Cruzinimage pistons, 447 type, 1mm oversize.
I understand that stock rings will be stamped with "R##" to differentiate the compression and wiper rings. I also understand that the compression and wiper rings are different thicknesses, and should only fit in the correct order.
However, that's not the case with these. The two thickest rings are stamped with "STD," and appear to have identical thicknesses - both rings fit into both grooves, regardless of the order (see pics).
The rings are differentiated on the following base:
Ring #1: Silver (chrome) finish on the outer edge. Beveled on the outer edge.
Ring #2: All black. Appears to have a perfectly rectangular cross section.
From what I've learned, I THINK the chrome-plated + beveled ring is the top compression ring, but I wanted to make sure I'm not off-base. Can anybody confirm the installation order for the rings that ship with the Cruzinimage pistons?
Stamped with "STD"
Chrome plated on left, black finish (cast iron?) on right
Rings fit in grooves in either order