I'm ajhank, My 440 LTD won't pull away from a stop until it has been running at high RPM for a mile or more, and completely heated up. After that it runs normal. I can let it idle for 10 minutes and it still won't pull from a stop. I have played with the idle mixture from 1-4 turns with no change. If I shut it down for more than 5 min. I have to go thru the process again. I have shimmed the slide needles .025", with no change. This bike only has 1300 miles. Do some jets need changed? HELP!!