Re: Enough Power?
The stock engines both the 49 cc four stroke and the 66cc 2 stroke will get you up those hills especially with the stock 44 tooth sprocket. The question is....how fast do you want to get up those hills :P For torque and speed the there is no substitute for an engine that has a power stroke every time it hits TDC. I would go with a 2 stroke. If its not powerfull enough stock then port it and put an expantion chamber on it.
Warning! if you want reliability your going to have to get a rear mounted 2 stroke kit built in America or Japan. Not china