So my z400 wasn't starting well (you'd have to give it a lot of gas), spark plug was good even tried a different one just in case. So my husband decided it must be a dirty carb. He took it apart and when taking off the diaphram cover the spring inside shot out and we couldn't find it. My husband happens to have a broke down '69 beetle and decided to take the same spring off it's carb it appeared to be a perfect fit. He cleaned it all and put it all back together and tried to start it but nothing, the engine turns over but it won't fire up. He was examining the tps and thought the white plastic dial in the middle seemed too loose, like it shouldn't be that loose. Don't know if this has anything to do with anything. As far as he can tell everything is in it's place and where it should go. Any ideas??