I'm not sure if this would help you or not, but I have a complete running motor out of a 74 or 75 Scorpion stinger. I believe it is a Ceyuna (?? spelling??) 400 cc. I trashed the chassis many years ago but saved the motor and pipe and clutch because the darn thing ran so good. I aways thought maybe I could use it for something, but of course its been collecting dust for a decade at least. I would be willing to sell the whole works if your intrested. Not sure about the stingerette. Is that a kids modle?