I know a shop owner who has a kawasaki ZX-12 with 89,000 miles on it and it looks like it just came off the showroom. It doesn't matter what kind of bike it is, as long as it is properly maintained and cared for. Having said that, Kawi's still suck.

 

25k is nothing to most any bike nowadays. now if the oil has never been changed, sure its probably close to the end of its life, but if its been loved, or even remotely taken care of, its no problem and nothing to worry about at all.

just look at the Honda CBR track record in the 600 class, they're incredibly well built machines, and with some maintainence, they'll go probably well into the 200k range I'm betting.

 

Honda's motors are pretty much bulletproof. They do have weak spots like any other motor, but it's not a big deal. For instance, a plague of CBR's has been the hydraulic cam chain tensioner. It's not hard to replace, and the part costs less than $100. Also, I think some of the bigger bikes (929's maybe?) had a recall on clutch baskets. But I don't know of any other problems with a Honda.

As far as carbs Vs fuel injection goes, carbs are a lot easier to work on than FI, but they require periodic maintenance such as cleaning and synchronizing. The benefit of fuel injection though is that you can get a Power Commander and have your bike dyno tuned to get about 8% more HP. If you live in a colder area, carbureted bikes can also be a bitch to start, and obviously you don't have that problem with FI.

 

you still have to synchronize FI systems from time to time. but they ARE much more reliable than carbs in terms of maintainence, and stuff like that.

 

some slight misinformation here
FI throttle bodies require no more maintenance than carburetors. If carbs get dirty its due to some neglect from the owner, the same would be true for throttle bodies (though throttle bodies are a bit more resilient to abuse). Synchonizing is also required for throttle bodies as well. In fact, the procedure is almost identical.

There's no reason you couldn't dyno tune carbs with a jet kit (instead of a power commander), to get more HP.

Again, there's no difference here between carbs and FI here. Just make sure the choke is working properly (or automatic choke for FI).