Question for anyone who can answer it. We have a 2000 400EX that we have been working on for the past 2 months. We have had everything from a weak spark to a stretched timing chain. All of that has been fixed. During the troubleshooting process we rebuilt the carburetor and now it is very hard to get running, and when it does finally fire and start, half throttle is needed to keep it going. Sometimes it will smooth out and you can ease off on the throttle, but when this happens it will pick up RPM and just die almost like it is starving for gas. It is almost like someone turned the petcock off. I have taken the carburetor apart and am soaking in lacquer thinner right now. Where should I focus my attention on to fix this problem? Thanks in advance. Also, I did buy a carburetor rebuild kit and installed new parts.

Question for anyone who can answer it. We have a 2000 400EX that we have been working on for the past 2 months. We have had everything from a weak spark to a stretched timing chain. All of that has been fixed. During the troubleshooting process we rebuilt the carburetor and now it is very hard to get running, and when it does finally fire and start, half throttle is needed to keep it going. Sometimes it will smooth out and you can ease off on the throttle, but when this happens it will pick up RPM and just die almost like it is starving for gas. It is almost like someone turned the petcock off. I have taken the carburetor apart and am soaking in lacquer thinner right now. Where should I focus my attention on to fix this problem? Thanks in advance. Also, I did buy a carburetor rebuild kit and installed new parts.