When it comes to the CA72-77 Honda Dream carburetors, Honda has perpetuated an error in the size and part number of the flange in their parts books and online part listings.
I have what appeared to be a nearly new Dream carburetor on hand, but the flange o-ring needed replacing. Normally, this isn’t a big deal, however when you look up the part number for the o-ring, you get a 16173-259-004 (Keihin) part number, listed in the 1968 US parts book as a 31mm part. Looking up the part number online gives a 24x2.4 size instead.
Most of Honda’s o-rings of that type are 2.4mm thickness. When I ordered that part number from an eBay seller, which came with the original parts tag, it was woefully too small at 24x2.4. Nosing around the internet, I found 91307-958-003 31.7x2.4 o-ring that is pretty close to what is needed. That part is listed for an ATC185, but searching the part number comes up empty now. 91306-MA6-005,
91305-KRM-840, 91305-KYY-900 all come up now as 31.7x2.4 o-rings currently, when you search by the o-ring size. Also, in the search by size, 09280-32006 came up as a Suzuki part number.
Measuring the o-ring channel on the carburetor, gave a measurement closer to 32mm and perhaps 2.7 width. For $12.76 I found I could order 10 o-rings in a 32x2.4 size from China, but obviously there is a delay in getting them, rather than buying from eBay sellers or Honda dealers.
So, I have ordered a few versions and we’ll see which ones are the best fit, in the end. DO NOT order by what is listed in the parts books and online parts microfiche!
Bill Silver
aka MrHonda
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