Bike: 2002 DRZ400S Long time lurker here and am posting now that I've tried everything short of removing the carb. Basically, I bought a DRZ400 a week ago. The test ride went fine though it had some backfire on deceleration - no big deal, and the seller made sure to point out that the petcock was leaking a bit - being inexperienced with vacuum petcocks, I figured the fuel hose just needed replaced. Fast forward a week and I've replaced the petcock with a manual one and plugged the vacuum line. Now the bike will not idle at all. I've tried having the throttle stop all the way in, all the way out, and everywhere in between and it still has the same issue - it'll start up, rev quite high, then if I don't rev it with the throttle it dies. When revving it with the throttle it sounds like it'll be fine, but when I stop it'll die almost instantly. If I keep revving it'll start to sound bogged then eventually will die. I made sure the vacuum hose was completely plugged with a snug bolt. One other thing is that the fuel outlet on the new petcock is quite smaller than the stock one, but tightening the clasp seemed to give a good seal. Here's the replacement petcock: http://www.amazon.com/gp/product/B009B07YYK Anyone ever have this issue or have any ideas?