I am having a problem w/ chain/clutch?

There is this problem that I keep running into, and I can't seem to find any info on here. I had my bike running, not running well, but running. Anyways I shut it down and came back the next day to tune it up, and I turned the carb adjustment until it was tight then turned it counter clockwise 3 1/2 to 4 turns like the instructions said, and when i popped my clutch the back wheel locked up, so i pulled in my clutch and attempted to start again and my chain popped off. I put the chain back on and tryed once again and this time it locked up the rear wheel and broke the chain, and now like 4 or 5 links are all bent and need to be replaced. Does anyone have any idea of what my problem might be? I couldn't post pics here but here is a link to my pics of the bike. New Bike Project pictures by rkorson4209 - Photobucket

Well I got my chain problem solved now after reading endless posts on here. Now my bike seems to be running pretty good, but for some reason I am unable to turn the choke all the way off or it will bog down. Also what it just started doing is when I disengage my clutch to let it idle it seems to rev really fast and its smoking pretty bad I even have smoke pouring out of the head around the seems is this normal or no

yeah i know now that it WAS the chain tensioner, I finally figured after reading that it was too loose, so as I was raising up the wheel I also noticed the chain was basically riding on the edge lip of the wheel, so I fixed all of that. Then I was having problems with my engine reving to fast when I pulled the clutch in, and my head was smoking, so Thanks to another member on here, I learned that I needed to tighten not only the bolts on the head, but also on the carb manifold, amongst a couple other things, which really helped out alot, my engine was running really smooth, and today was a really nice day, so I was just gonna go for a long ride to work on breaking it in, and I got about a half mile from my house, and I'm not quite sure how this happened, but somehow my rear fender got ripped forward, broke the bracket and threw the fender uner the wheel, I instantly went into a slide at 30 mph like a drift, and I had noticed cars were coming so I tried to steer off the road, I slid like 6 or 7 feet like that when I tried to turn and my bike slipped out from under me slammed me on the ground, where I continued to slide another few feet. The bike is actually in decent condition yet, but in my eyes its wrecked, lol. The seat is torn, fender is needless to say done for and and a few other minor things. I haven't tried to start it yet as my tailbone is wrecked, and a bike seat doesn't look very comfy right now I am thinking that it was the chain that cought the fender.