Ok, I have an '08 250. The manual that, I found under the seat, stated the bike is an EX250J. I still have not read through it completely. Since the 18th of July, this is what I have currently done to the bike: new oil mobile 1 4T race Syn 10w-40, new K&N high flow oil filter, new K&N high flow cotton air filter, Danmoto JISU slip on exhaust and last NGK Iridium spark plugs(yesterday) + almost 1100 miles haha. Before I had done anything to the bike the snorkel was already off and the bike idled smooth, at 1500 when warmed up. when I changed oil + filter and air filter, the bike started idling around 1800-1900 approx. When I put the exhaust on the dike started to idle around 2000 give/take 50. I retarded the idle with the adjustment knob on the left side of the bike to 1300-1400 approx.
My idle now bounces from 1400 to 1300 +/- 50 when the bike is warmed up. The guy I bought the bike from (my old boss) did not do any work to or even pull the fairings off the bike and only had put 100-200 miles on the bike before I bought it. A gal had the bike as a commuter to college and had taken it to a well known motorcycle shop in Vancouver, WA and had a tune up before the bike sat in a garage for approx. a year before my boss purchased it. That is all the information I have on the bike without taking it in and having it disected.
Last edited by Clownin; 07-29-2014 at 09:37 AM.