Well, not exactly new, but new to me.
Anyways, I've been riding for two years, started with a 96 kawasaki ZX6e, then upgraded to a 03 gsxr750, now its time to move on up, so...

Got a 98 Kawasaki ZX9R yesterday.

Only problem, I laid it down almost right after getting it. Apparently the bike was sitting there for like 6 months or something, and I decided to take it for a spin a little after riding it home. Anyways, I was riding for approximately 30 minutes, and made a left turn at an intersection near my house. I just barely started to lean, (I was only going about 10mph or 15mph) and the rear tire started losing traction, I tried to straighten it up a little, but it was too late and lowsided

Luckily there was no mechanical damage to the bike, only scuffed up fairing and stator cover.

I braked before the turn, so braking didn't cause it, and I didn't throttle it through the turn, so that didn't cause the tire to spin out either.

Anybody know wtf could've happened? The tire had sufficient tread, and I rode it long enough to warm it up. Could the tire have hardened or something after not being ridden for so long?
I'm also pretty sure I didn't slip on gravel cuz I didn't see any gravel in the intersection.

I loaded it onto a trailer afterward to get it home, and the rear tire valve stem broke right off, which seemed pretty weird.

I've gone through that intersection many times before, and gotten much, much lower, which has me stumped.