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Hi all, does anyone know what is the diameter of the YR4 diff balls? I would say 3mm, but I'm not sure.. And I don't have any to measure here with me.
Thanks!!

UP!..
In my opinion all the Yokomo diffs have balls with the same diameter..
And they should be metric (thus 3mm).
Anyone with spare balls to measure?
PLS!

The Yokomo YR-4 came with 3mm diff balls (same as YZ870C, Works '91, Works '92 and Works '93).

Not all Yokomo models (off road and on road) came with metric diff balls. The 1994 New YZ10 came with 3/32 diff balls.

Vin

Thanks! Now I know what to look for..
Bye

excellent info!! Now who knows what will work for the smaller thrust balls and thrust washers for the 88-90 YZ10?
Thanks,
Doug

The thrust balls should be 1.2mm, as those for the YR4.
However the dimension of the thrust balls and washers is not really critical since the only constraint is the internal diameter of the outdrive.
You could use slightly larger or slightly smaller balls without problems.
You could also use conical washers from other brand diffs instead of the proper spring washer, or even a small spring (probably you would need a longer screw in that case).
Bye

Just to be precise: I rebuilt my 870C diff using 9 1.5mm thrust balls.
For sure 9 or 10 1.2mm balls would work as fine.

Thanks for the info! My diffs, actually my whole car, is still brand new, but as we're probably going to run it, we're trying to gather info for when we do need parts!
Thanks again,
Doug