Re: 92 rxl questions
You got a good machine as far as I'm concerned. I have a 1990 indy 650, and the motor is flawless after 6400 miles. My buddy has a 92 RXL with pipes a chip and a clutch kit. Usually mods mean only trouble but he has never had a problem. In fact he is so content with it that we put an Xtra 10 suspension under it this summer.
You want to make sure when you kill it that you shut the key off as well. The ignition/fuel pump will stay hot otherwise, and will drain the battery. My buddy found that out the hard way! The only other trouble I know of that he has had was that it dropped an injector once. No big deal, If i remember it wasn't that expensive to have fixed. Also, it has a cold idle circuit, and it(at least my friends) doesn't like to move at all until after a couple minutes of warm up. So don't think you've fouled any plugs until after you let it idle for a bit. They will foul plugs though, My buds dad has a 92 RXL SKS, and it did foul even after the warm up. Just changed 'em out and it was fine.
The only other thing I can think of would go for any machine. 5300 miles, has it had a rebuild? If not you may need a top end within a couple years. Also, have the clutches been gone through? Check the primary rollers for flat spots, rust. If the rollers seize or wear out their bushings, and the clutch starts to bind you could be in for big money. I rebuilt my clutches this summer, for less than 60 bucks for both. Finally, just idler wheels and bearings? They're cheap enough.
Have fun, they get great mileage I think you'll like it. I'm considering getting a 1995 one as my backup machine.