Originally Posted by Creative Engineering
66cc, 80cc who knows? Maybe it's Hong Kong math?
For the 80cc it reads: 47mm bore X 40mm stroke = 80cm3 If you do the math it comes out to 69cc. The advertised bore and stroke are correct. Their math used to arrive at the cc value of 80 is not!
Maybe in China pi is really 3.6 instead of 3.14??? That'll get you to 79.524cc