Sounds like your CDI. Its a retangled black box about 1" wide and almost 2" long and the underside is green most times. Here is your CDI.http://www.pocketbikeplanet.com/attachment.php?attachmentid=50435&d=1339090964 Take a good look and see if it looks swollen or looks like it got hot may have some burnt marks on it. You may also want to check for spark pull the plug wire and put a plug in it and lay it againt the frame or cylinder. If the spark is blue the coil is good if its orange the coil is bad and from the looks of it the plug wire at the coil may have broke connection where it goings in to the coil. In which case unscrew the wire and cut about 1/2" off of it and screw it back into the coil try again.