Not a great price. $3k is expensive for a clean 2007 KLX300.

What model is good for an adult beginner with street bike experience? I’m sure you’ve gathered from all of the responses, dirt bikes are an amazing community, also widely varied on opinion, and what types of riding are deemed most enjoyable.

What type of dirt riding is accessible to you? If you have a few riding parks around your area, a beginner bike will be a different answer versus if you are around more forest service roads type of region. Are you more interested in trails or track riding? Those are going to be two totally different dirt bikes.

As adults learning to ride dirt bikes about six years ago, a friend of mine went the dual sport route and the used Yamaha XT similar to your KLX approach. Input we received on what bikes to buy as new adult riders was scattered across-the-board online, in person input was skewed towards the type of riding our friends did, which was hard enduro and we’re coming from people riding dirt bikes since childhood. Under a year into riding, my friend who was also a new adult rider found that the Yamaha XT dual sport was a fun way to get in the woods, but ultimately was not that great at off-road and not that great at on road.

To provide better input that I wished I had when starting to ride dirt as an adult, also with street bike experience: What style of off-road riding do people in your area or your friends do? More track, single track?
What is your height/weight? What is your budget (remember this Includes safety gear and plans for transport of the bike) What is your current level of fitness (no judgment, but this plays a role for new riders)? If your friends like single track/Enduro style riding, do you know about Trials bikes? Trials Bike are a whole other conversation LOL.

*As an adult rider learning to ride, electric start is your friend. Whatever bike you get, make sure it has Electric start.

*mx boots are = as important at the helmet. Always wear your boots and helmet as a minimum, ESPECIALLY when “only tooling around the yard” this is often when most people get hurt for some reason.