Biggest screwover I got was a rim that was listed as being from an FZR (looked like it) but was a YZF rim. Threw out my plans last winter for the conversion to the 17" rear.
Not unlike what I ended up with. I bid on and won the factory fairing for Dita. It looked like it needed paint, but was intact in the pics. The seller indicated it was considered a "paintable fairing" which meant it needed a little filler and paint. When it arrived -every- mounting hole had stress cracks or chips or was simply coming apart ( I could see light through the sides of one of the mounting holes. It had been repaired at least once, but not well. Major work required to put it back together. It's still sitting in my shed.
Best advice I can offer is only buy from people that have a fair amount of transactions, a high % rating, and accepts PayPal.
This guy had all of that. That's what surprised me.
I bought a set of forks for my FZR and they were top notch shape. I actually spent less buying used forks than getting the seals replaced...go figure. If you ever need help/advice on something let me know. Hell I can bid on something for you if you don't want to deal with it yourself. Hopefully, though, you'll be able to get all your parts locally.
Well,.. we did pick the bike up. Looks like H2Rick and Zen's warnings came too late.
But,.. the bike isn't as bad as I apparently made it out to be. When it went down, it slid for about 4" by the looks of the gravel samples on the lower fairing. The story we got was that the guy had lost it in a low speed corner when he hit some gravel. The marks on the bike support the story. The mirror got broken, and the signal is present, but uuuuuuuuuuugly.
So,.. we're going to go with some EMGO mirrors if we can't find a used OEM one. The signal cost us $10. We didn't budget for the bar end weights, but we decided to splurge on them. That was an extra $50, but we saved that on the signal light.
The seat I can fix for about $15. Recovering it as per a couple of posts on the CBR sites.
The brake lever we're going to try to torch and bend back. Same with the foot peg bracket. Both are already off the bike.
Only one of the fork seals is shot, so we'll replace that one, and see how the other one does. We have that seal too, and that should be done in the next few days.
The Alt cover and exhaust are going to be left alone.
That just leaves the body work. The neighbor didn't have the parts we needed. They were from a 1998 CBR900RR. He's looked at the fairings, and says they're a cinch to fix, and is going to bring me the materials to do it.
Keep us posted on what you decide 
So, I rode it home on thursday. The bars were fine in the city, but the vibration was just too much on the highway. I found myself alternating hands on the bars. Hence the bar end weights.
The only real complaint I have about the bike is its built in seat warmers. In moist 90 degree heat, having the rad fan, RR and fairings all directing their heat to my left leg and on the seat was severely unpleasant. Reading on the net, this is a common ( i.e. not problem) thing with the F4 and F4i. They're affectionately known as "nut roasters/cat roasters" (not my term.) Apparently it's something you get used to?!?!? Personally, I think it's something you develop callouses for. The problem occurs under about 60kph, and isn't as bad when stopped as it is when moving "slowly".
It's nice and smooth on the highway ( not including the bars) and the wind protection is -really- nice on the highway, compared to the nakeds I'm used to.
Low speed turning is disorienting when the dash keeps going straight and the wheel is turned. I almost dropped it in the grass because of that, but I caught it.
The other half says it's a wheelie machine, but I ride it like my 919. That means I usually shift around 4K, and not once did it even consider lifting the front end. Yup,.. all that torque in my daily rider has spoiled me for a high revving bike.
He LOVES the bike. I've told him to keep his eye on the ball, that we're going to get him a newer one that's seen slightly better days. We have 2 potential buyers already. 600s are really popular here.
