Im a newbie when it comes to bike repair and maintenance, and my kawasaki z200 is giving me the shits. It seems that it might be also called a kz200.. It rarely starts, but does start when i roll it down the hill. When i try to start it, it really tries but doesnt catch, i checked the spark plug and it does spark. i took it for a ride and after about 20 minutes it started to run really rough and jerk me around a bit, before the revs slowly dropped regardless of what i tried to do, and then it cut out. Not fun when its 30 degrees and you need to push the bugger for a couple of kms. I took the carby apart and had a bit of a look, (without really knowing what i was looking for) but it looked ok to someone who has no clue. I checked the fuel lines for blocks but couldnt come up with anything. Im at the point where i throw my hands in the air and send it to the bike shop, but dont want to pay the big bucks if i can help it. Any ideas? suggestions?