I bought a 2008 Kawasaki ninja 250r. I just notived there is some black dust (carbon/coalish color) under the exhaust pipe, what could that be?Also, the owner told me to run the motorcycle for 20 minutes every day, if I wont be riding it that day, any reason why? and do I have to do this?when I brake, do I need to pull in the clutch and then brake? or it doesnt matter?lastly, is there any way I could know when the last oil change/tune up was done? I wasn‘t given any maintenance records, but the oil level seems fine.Thx.
