The only difference between the Y-33 and the Y-50 were the components and color. The frames are identical minus the paint. I can't remember which model, but there is one of that era that has a natural finish!
This frame was similar in design to the Gary Fisher Full Suspn at the time. I had a GF Z-1 and enjoyed the heck out of it! Mine came with a lock-out and I never used the thing!
Granted, I'm not an expert class racer, nor did I ever race the bike, so a little pedal induced bobbing never affected me.
If you're into Carbon and want a nice set of brand new still in box never been mounted Spinergy 4 spoke wheels let me know! They'd go great with that bike!
Enjoy the bike!
L8R
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger