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I have an 03 Suzuki LTZ400. I made the mistake of letting it sit a couple of months with some apparent bad gas. I tore the carburetor apart and the needle & seat were completely seized up. I replaced them and cleaned the jets. I put everything back together and it still ran really bad. I went ahead and took into the motorcycle shop. They tore the carb apart and gave it a thorough cleaning. When I went to pick it up the mechanic said that he got it running good, but the pet cock was bad. He said that he recommended putting a new one on it (~$110), but he would have to order it and that he had "rigged" it to where it would run fine in the meantime. He capped of the vaccum line at the carb and flugged the line coming from the pet cock and put the cock on Prime. He was right in the fact that it runs fine that way. I decided to try to find a cheaper alternative than paying the $100+ for the valve. I found a used one that came of a bike that was supposed to be working good when the motor seized up. I changed out the fuel cocks and hook back up the vacuum line. When I started it, it started missing and back firing. I plugged off the vacuum line again, put it on Prime, and it ran fine again. What are the odds that I have 2 bad pet cocks? Can the pet cock be taken apart and cleaned? Could this still be a carb issue with the vacuum? Any help would be greatly appreciated.