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Dick Eastman
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Joined: Tue Aug 02, 2011 8:27 pm
Location: Troy Ohio

Rings

Post by Dick Eastman » Tue Dec 08, 2015 7:46 am

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?

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G-Man
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Post by G-Man » Tue Dec 08, 2015 12:41 pm

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

G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

Dick Eastman
honda305.com Member
Posts: 273
Joined: Tue Aug 02, 2011 8:27 pm
Location: Troy Ohio

Post by Dick Eastman » Wed Dec 09, 2015 10:18 pm

G-Man wrote: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.

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