I'm really new to all this dirt biking and only rode a few times. I'm getting my own tomorrow, a Kawasaki KX 125. I'm wondering what kind of "major" problems I should look for and what I should check on the bike before buying it? The person selling claims that the spark plugs need to be changed to start it. How can I check and make sure that it is just the spark plugs? Thank you all in advance!