Rings

[Dick Eastman]

Trying to figure the numbers out, have two parts manuals.The first manual is American Honda, [c]2002:
For .25mm o/s rings:
13020-275-000 X 0110001-0109755
13020-275-000 X 0110001-
13022-275-000 Z 0110001-0109755
13022-275-000 Z 0210604-

Next manual, download from Classic Cycles.org, [CB77 revised Aug.1,1969]
13020-275-000 CB77E-110001 to CB77E-210603
13022-275-000 CB77E100001 to CB77E-109755 and CB77E-210604-

At Ohio Cycle, these are listed:
CA,CL,CB77 13020-275-000 1.5MM THICK

[I need .75mm o/s also, and above applies, except they are 13040 and 13042]

All my pistons have 1.5mm compression ring grooves and 2.8mm oil ring grooves. My three engines are 10319xx, 10401xx, and 10425xx.
From my engine no.s, it appears I should look for the 13022 numbers, but Ohio Cycle shows the 13020 w/1.5mm thickness, which are what my pistons are. What is the difference between the 13020 and the 13022? American Honda notes a difference - What gives?

[G-Man]

The part numbers with a "2" at the end indicate a chrome plated top ring. Supposed to give quicker bedding-in, I think.

G

[Dick Eastman]

The part numbers with a "2" at the end indicate a chrome plated top ring. Supposed to give quicker bedding-in, I think.

G

Thank you, Graham, that will help.