Ive had an '06 monkey 50cc and that stock engine only was 20-25 km slower.. acceleration was less.. fcourse, but dont underestimate those little bikes!!Haha not a very intimidating motorcycle gang lol.
I just read up on the monkey bike and it had only 4.5hp at 49cc. That is crazy small and weak. Do you even need a motorcycle license to ride one of these things?