My 03 is used. I have some idea of the previous owners maintenance schedule. I have the bike jetted perfectly. It does nothing funny and sounds fine. It starts 1 or 2 kicks hot or cold. My last few rides have been following XRs around the mountains so its ranged from putting around to WFO down jeep roads for 15 minutes or more. My plug is a bit black and sooty. The tip is light brownish deep inside it but the top threaded area is black. Is this normal or do I have an oil blowby problem?