I couldn't leave my new 2001 400-E alone. Several people have sent messages and made comments about my alleged 138 main jet being to small. Since the dealer put it in before I had a chance to ride it I had nothing to compare it to. You guys talk about lifting the front wheel being easy and I felt I had to work a little to hard at it. Anyway, I pulled the plug and it was whiter than a brand new pare of underware!!!dahhhhhhhh So much for trusting the dealer. They did give me the stock 142 main jet so I figured I would see what they had done to me. After looking threw the archives I decided what the hell and got after it. What a pain! It is hard to believe that enlarging the air box opening would help when the air still has to squeese through that little slot to get around the shock! I found the needle clip in the middle groove, three above and three below. I left it alone. It did indeed have a 138 main jet and the screw on the bottom was 1 1/2 turns out. I have a set of propane orfice drills (really nice) so I compared the 138 to the 142 and there is .004 difference. I went to my next drill size up which was .006 bigger than the 142 and drilled out the 138 and saved the stock 142. I ajusted the pilot screw out 2 1/2 turns and put it back together leaving the snorkel off the air box as before. I plan on leaving the exhaust stock. I hope my plug color becomes normal. I never heard any pinging or backfiring and I thought it was running great. Can someone tell me the scoop on the needle rod moving the clip which way to rich and lean. What is it for? Midrange or transition from idle to main? I live at 5,000 ft so I didn't want to go overboard on the jeting. I started it in the garage and it wasn't as cold blooded as before. I only have about 500 miles on her. Most of the time I was on and off the gas trail riding but the last time out I ran it about 5 miles at 70mph then loaded it on the trailer. Thats why I figured the plug reading would be ok for the main. Did I miss anything?