(New to the forums)I just got a 2000 rm250 for $1000.as my first dirt bike I have experience with quads but not dirtbikes. I'm only 15 and don't Know much about two strokes. Ok so lately it's been smoking white. And everytime I rev it blows white smoke. It also spits oil out of the silencer. The guy I bought of said he ran castor 40:1. The other day I went to a bike shop a guy told me that I should run it 32:1 but he also said I was gonna foul plugs but he said it's better to run the bike at that to keep the engine from wearing out. So I bought some Honda 2stroke oil and got myself a ratio rite cup and mixed it at 32:1. After that I went to go ride out in the dessert(Barstow,CA). I turn on the bike and it smokes quite a bit. I also noticed it didn't have that nice rev 2 strokes should have. I also at times it would turn of on me and I would have to kick it like 10 times to turn it on. Is it Fouling the plug? Flooding? The plug is a black color. It would kinda poped a little when I would twist the throttle threw gears. Sounded like it was revving to high and didn't sound smooth. Then today I started it and it started idling really low and it would pop when I would let go of the throttle. Also I think my clutch side cover is cracking core me if I'm wrong. The bike has quite some oil on the head pipe and under the engine. I have no idea where the oil comes from. I had already degreased and washed the bike. Also does any body know which is the coolant drain bolt? Tell me if you guys see anything usual. All I have done to the bike is change gear oil, clean filter, clean silencer, change coolant(had to drain through the hoses couldn't find the bolt), fresh fuel. Also when I changed the gear oil it was like chocolate brown and smelled burned. Is that good or bad? Also if you see the photo with the clutch cover it looks like it's cracking I'm not to sure. Thanks for any help! Thank you for any help.