Hey guys I am new here. I picked up a 2000 YZ426 this week for a song and dance. I knew it needed a little work but I love doing this stuff. Anyways I get the bike home drained the fuel from the tank and carb and replaced. Tried to start it using the "start method" and it would fire for a second and that was it. So yesterday I did the valve adjustment and all are in spec. Timing dots are dead on, carb was pulled completely apart and cleaned, New plug ( tried 2 different new plugs). Now if you turn the idle all the way up and use the start method it will start for 5-10 seconds ( sounds rough ) but the second you touch the throttle it dies. I checked the acc. pump and it shoots a nice stream of gas when applied. This bike is completely stock with stock jetting. Any help much appreciated. You could save what little sanity I have left LOL.