The parts list that is contained within the combined 71-73 100cc-175cc pdf, found in the download section here, lists three separate part numbers for the ref #32 in the diagram.

32     93315-31502-00 BEARING
32-1  93311-31507-00  BEARING, CYLINDER.#11 (DIA. 23MM)
32-2  93311-31567-00 BEARING, CYLINDRICAL 1

The first one can't be correct. Photographs show this to have a very thin race, unlike what is currently installed and the part number is the same as the drive axle needle bearing which does have a thin race.

The diameter of the hole is about 23mm so the second entry would be my guess but being new to this I thought I'd better ask.

thanks,
Rob




 

Compare the specs of your bearing to a TA1512

What's the engine number?

Nevermind.  The bulletin I was thinking of doesn't have VIN's listed...  There's a copy in the manual you're looking at on about page 150 of the PDF.  Bulletin 336

Should be the 31507 like you said.  Dimensions should be 15mm ID x 23mm OD x 12mm wide. 
(The 31567 "might" be a new number for the 31507 but the pic on Partzilla seems to show a "TR1525" which is not correct as the specs I found look like it has a 25mm OD.) 


The 31502 is for the output shaft on earlier models before they made the change to a bigger OD bearing somewhere in the CT2 model run. 

Note that 31502 is still used for the needle bearing on the clutch shaft.

Thank you!