Crash90 I assume you are talking about the 80" extra300s. If so I would say YS140dz /Saito 1.80 for a 4 stroke or O.S 1.60fx or Moki 1.8 / 2.1 for the 2 cycles. I have never looked at one up close to examine it's construction quality but from what I hear you should be ok with a 42cc Gas engine on it. I would go for the DA50 if I was going the gas route.