Hello, I'm new to the thread and relatively new to dirt bikes. I had one in jr. high school but i am now 27 so yeah, its been a while. I just picked up a 98 yz 400f for 1,000 bucks. it runs great and starts easy but after riding it leaks oil out of the tube that comes down from the top of the engine on the left side. I've cruised the forums and found out that it is common to leak a few drops of oil here, but i think mine is leaking excessively. after every ride, be it ten minutes or two hours, i end up with about a 4 to 6 inch puddle of oil on the floor. it does not happen quick, but leaks out little by little after it is parked. is this something i need to worry about?