Hello all, I'm looking to replace the motor on my bike for this summer. Unfortunately, my bike had a little encounter with the lawn mower last fall and it now has a busted case. Rather than replace the case, I'd like to use this as my excuse to install a motor with a little more power. So, I'm after an 80cc 2-stroke engine. I'd like to have something around 4hp if possible. And it's got to be of the same mounting configuration as the regular china girl kit motors. Budget is mostly open, but I'd like to keep it under $200 if possible. Give me your recommendations and thanks in advance!