I assume you are referring to an lt250R. I know more than I really care to about them, my cousin had one and I spent a lot of time working on it.
His was an 86, which was only the 2nd year for them, and it was the non-powervalve motor. It made a little less power than the newer generation but not a huge difference. They're comparable with the other 250 2 stroke racers from the 80's, the honda 250r and the kawi tecate 4. For the era they were designed, the lt250r is a quick, nimble bike. They were pure-bred racers at the time, at the time they were considered to be stupid fast, by today's standards they're still pretty quick though, not 450 fast though. They handle ok, they're on the narrow side stock but they're light enough that they can still whip around better than bigger bikes, for pete's sake they only weigh around 320 lbs. I would rather have a honda 250r for the aftermarket parts support, or a tecate 4 because they're better performers and they're just a damn cool looking bike and I love lime green.
To say they lack in the midrange would be an incorrect statement. The low end power on them is pretty much non-existent, feels like a 4 wheeled weed whacker, but it hits strong in the midrange and the top end keeps on pulling hard. It's a 2 stroke, that's how they roll.
On the downside, please consider this though. Even though it was the last of the 2 stroke racers aside from the banshee and the blaster, it's still been 18 years since one of these has been produced. Replacement parts are hard to find and aftermarket support has faded off to near nothing. An 18 year old bike will surely need parts from time to time and aside from normal wear items, you could end up searching a while or have to have what you need custom made. Most of them were also rode hard and put away wet, and 2 strokes tend to be temperamental to begin with so don't sell the warrior, you'll want to have something you can ride while you're working on it. My cousin had his for about 2 years and in that time it was probably in good running shape for about 6 months all together. Granted, part of that was because he was broke and didn't have the money, but even simple **** like ball joints took weeks to track down sometimes.
To answer exactly how fast they are though, a good answer would be fast enough to make your warrior feel like **** for a couple weeks. Every time I rode my cousin's ltr the warrior seemed about as fast as my lawn mower the next couple times I rode it. Top speed with good gearing stock would probably run in the low 70's, and his was quick enough off the line to take a vito's 240 blaster by a couple lengths in a 200 foot drag. They're fun bikes, all 2 strokes tend to feel much faster than they actually are, just be very careful about buying one in poor or questionable condition, you'll quickly find yourself in an expensive and frustrating position.