raising the needle makes it leaner, move it down. you can take the autochoke off the head, just a few bolts, but you need to plug the hole on the intake. heres the manual if you need more info.
http://www.mopedriders.org/html/manuals/honda/uexpress/huexpresssm.htm
whats your setup right now? mine is all stock except for proma circuit & bigger jet. runs great, except it sucks water into the float bowl when it rains. just pushed it home in the rain, fun fun. time to check for leaks...