I bought a nice looking purple scrambler 500 for 400, it acted like the carb was clogged, but it turned out there was all sorts of problems, mostly from shitty mechanic work. The flywheel was busted, the stator was bad, it was out of time by one tooth and the chain was stretched. The cam looked brand new almost, also the decompression spring was installed wrong. Anyway i have fixed most everything and got it to run but now again i am back to the carb not working. I have rebuilt the carb using an ebay rebuild kit, and already had to re install the old float needle since the new one just would not seal. Now it's really hard to start, when it does start it will idle fine but will not take gas , so i removed the air box and filter again and adjusted the choke completely in so that can't be the problem, but what it is doing is the slide will not raise up, i can reach in and push the slide up with my fingers and it takes gas really good, but it just wont work by itself and also it is making huge amounts of carbon, obviously it is running rich , i am not sure if its because the slide wont open or the jets in my rebuild kit are all wrong, but first things first , what could be making the vacuum slide not operate? I can't find any leaks , my pulse hose to the fuel pump is not loose , it pumps fuel, the diaphragm looks good and was installed properly in the top , i can't find the problem. I am thinking about buying a new carb , and have heard i can get a 40 mm carb and turn this 97 into an HO , does anyone know about this and what year carb will interchange ? Anyone know why i am having these problems?