A question I have:
Were all BOI forks suspension corrected? Mine appears to be, and many of the ones I've seen have tons of tire clearance compared to the yo eddy fork, this can be seen in the pics; it's a much taller fork.
Here is some info that I received in an e-mail directly from Fat City quite a few years ago, that may help solve some of your fork questions:
"There are two different forks and it gets more complicated than that.
First of all, the threaded Yo Eddy! fork was introduced with 1 1/8" diameter blades. Some time later, threadless steerers were introduced.
Then, in 1992, our Big One Inch fork was introduced -- still not suspension adjusted -- and, if I recall correctly, that was exclusively threadless.
Then, we built many Big One Inch forks adjusted for 2" of suspension compatibility and then, finally, after we moved to New York, they were adjusted for 2 1/2" of suspension compatibility.
The trick to identifying these many creatures is to measure the blade length. That will be the determining factor in establishing the vintage. Blade OD will help to identify the vintage, as well, as in ALL Big One Inch forks are more recent than the pre-suspension Yo Eddy! forks."