A little background. I bought a '00 WR400 that had not run in 12-18 months. After picking up a tank thanks to this site and doing the free mods. I'm having an odd problem. I've had to remove and clean carb. two times and now bike only wants to start w/o the choke. Usually with a gummed up carb. it's right the opposite; will only run with choke on. I did change jet from 158 to 160 but can't see that making a difference in starting. Thanks for any advice/input.