Wifes sled is a 97 Jag 440. While reving it up on the stand, it bogs when you first punch the throttle. You have to feather the throttle until the rpms are high enough for the clutch to engage and then the response is good. It only happens when you raise rpms from an idle. Gas is good, carb is clean, and I changed the main jet from 310 to 300. Any other suggestions? Need to get it fixed cause wife is threatening to take my sled for the winter if hers isnt fixed.