Originally Posted by recon chris
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
You may want to tell the members of this site that their made in china 4strokes are garbage then!! Being that quite a few have more then 3000 miles on them with no problems
Live life as its your last day... it just may be
Learn to do it right or how to fix it later, quicker to do it right the first time.