I have an 89 ninja 250r that I can get to start occasionally when the choke is on all the way and when it does it barely idles and when it will idle i take the choke off and it dies. Ive taken the carb off and took it to the kawasaki dealer down the road and they checked everything on it and said it was perfectly fine other then all the dust on the outside of it. So now i am trying to figure out what is going on with it. I get plenty of spark. Havent checked the compression yet because I dont have one to do it with yet. When it does idle it has a really rough sound to it. I can feel the roughness of it running in the floor of the garage. And there sounds like there is a knock of sum sort. So I figured I would ask here to get sum insight as what to look for from you guys. thanks in advance!!!!!!!!!