it almost sounds as if the bike runs out of gas...1st gear tachs out @ 7 1/2, 2nd @ 7 1/2, 3rd and 4th @ 7, and 5th @ 6 (cruising speed) the bike ran fine until i put the jets and pipes on, I know that the problem is too much fuel or not enough or too much or not enough air, but if you "drive it like you stole it" it sounds as if the fuel bowls are being completely drained and the you have to "wait" (1 second or so) for them to fill back up again