Dirt Rider’s Community section showcases dirt bike blogs and interactive discussions in our dirt bike forums. Find information about off road riding locations, racing, news, events, parts, accessories, and more.
It looks like you ride wide open trails (made it to 3:12 on your vid), which is not the kx's strong point - it excels on a closed course, but is not meant to be a wide open trail bike.
What is your buddy riding? Have you considered a 250f instead of a 250 two stroke?
They're all good when they come out of the crate, so you'll need to judge each used bike on an individual basis. Some people take care of their bikes, and some don't. When you go to look at a bike, don't be in a rush, don't be pressured by the seller, and ask lots of questions. It helps to make up a list of questions ahead of time so you don't forget to ask something and this way you're asking each seller the same thing.
It looks like you're new here. If you want to get involved, click one of these buttons!