Hello all, I just picked up a yz 250 a couple weeks ago for 1100 bucks and im still not sure if it was a good deal or not. The bike is in overall good condition other than its going to need the back shock replaced which i was figured was 200 bucks most. The previous owner is an old friend and he traded it at an auction from a guy that was pretty wealthy and old, so we both figured it was in great shape engine wise. Of course there is a decent amount of rust on the underside of frame, but not much else where. Sorry for the short story.. but either way i rode it before i bought it and boy did it have some balls. It kicked over first kick and everything but my only concern was that after it warmed up, when you would stop or pull in the clutch some times to stop it would idle erratic and kind of high and not normal sounding. now we both figured it was just an old gas mix or just a wrong mix so i ended up buying it. I replaced gas with 93 octane pump and mixed 32:1 with yamalube, checked coolant good, and checked trans oil and looked pretty clean... i then proceeded to take it down to woods at my house and it was running good and great but after a while it started doing that high idle shit again so i was messing with air screw figuring maybe it was too lean so i turned it in which seemed to help but not that much it still had an odd sounding and high idle? i then took it home and took apart carb hoping it was just dirty or had plugged jet but it looked spot clean? then the day after it i started it and it stalled on me then would not start again? i'm thinking i possible got some water in the carb somehow so i drained carb took out plug and let her dry out while kicking it a few times with plug out. it then fired up the next day but still high idle!? also after riding the bike it leaves a spooge pile of light gray oil from pv overflow, which makes it sound like a rich condition? but the high idle sounds like a lean condition? Sorry for saying so much but i just wanted to be as descriptive as possible so if someone can help me out all the details are there. i also am just wondering if this is a more serious problem or is it something i am overlooking? i cleaned the carb and it seemed really clean already the only place with some dirt was in the choke area which is because the choke valve also controls idle and was loose which is possibly where i think i may have taken in water? if i am wrong in any aspect please someone correct me. i am open to any suggestions considering i am fairly new to repairs on bikes. Thanks ahead of time if anyone can help me.