Hi all, Just wanted some advice on my zxr: I've recently cleaned the air filter, as I felt it was running quite dirty (black on the exhaust.) I spent 1 day of the weekend doing that (evident by my way eariler post where I dropped the screw in the engine area,) cleaning it with Metho and then Kero (wasn't sure if they used filter oil or motor oil on it,) trying to let it dry, and then soaking it with SAE30 motor oil before putting it back on. It's been about a month since, and it seems as if my exhaust is still running dirty. Just to get perspective, I ride about 3 times a week on average, sometimes more, and just recently after 2 rides from having cleaned the exhaust clean with baking soda, it left a brownish residue already. Just wanted to check does it sound about right as I presumed that most bikes would have start to dirt up after a month or so. Should I try to re-clean the filter (kero as I've used motor oil) wait until absolutely dry (even if it takes days) and then soak with oil? Or am I just being paranoid and just up and ride? Just wanted some opinions from people. It doesn't seem like the filter's close to worn out, and in any case, I've gotten a new filter to be safe. Maybe I should just change it? Opinions and help anyone?