I got the 01' OBEJP needle and the 03' optional AP diaphram for my 00' 426. I put the needle in the 3rd position and everything else is stock. I went riding yesterday at 3500 ft temp around 70-75F and the bike still has a slight bog off idle and seemed to have lost some of the hit it had before. Its not slower, it feels much smoother and doesn't rev as quickly. The top end pull feels stronger now too. Is that what the OBEJP needle should do? I've heard that the 01' needle was a must have, but never heard why its a must have. Any other ideas about this damn bog? The 03' diaphram was supposed to cure it but didn't. Thanks.