Last weekend I bought two 1982 honda urban expresses for $10 off of a friend of mine who had bought them off the side of the road for $30 about a year ago. One of them is just a pile of parts, and after some work the other is doing alright. So. here's the problem... it takes a /lot/ of work to get it started. Probably about 10-15 minutes of pounding on the kick start and fiddling with the throttle to get it started, and then once it starts, it revs pretty well while on the kickstand, but once I get on it, it doesn't do much more than idle or will rev in little bursts. I've been fiddling with the throttle screw and air screw on the carburetor, and adjusting the oil control screw (there's an "oil" light that comes on once it starts, and I don't know if 'm getting the right mixture of gas and oil). I knew that I was missing some parts, so I found the manual for it online (http://www.mopedriders.org/html/manuals/honda/uexpress/huexpresssm.htm). I'm missing the choke control and the air filter, but I've plugged up the choke lines with some spare bolts to temporarily solve that problem. Does anybody have an idea what could be wrong? If I make a further investment on this machine, should it be the choke control, or the air filter?