sorry dog
New Member
6 horse, that's 3-4 times what a stock China girl makes.
The HP numbers I've seen for the stock 66cc china girl is between 2.5 and 3 hp... which sounds about right for a 66cc low output 2 stroker. A 40 to 50CC chainsaw motor puts out 3 hp and I have a Stihl and a Partner concrete saw: 66cc and 4.4hp for the Stihl and Partner is 71cc and 4.8 hp. At least one of these saws is going to donate it's motor to either a mini go kart or bike project.
For your info... Zenoah's are traditionally used in hobby applications like large scale airplanes and larger R/C boats, but it was/is the main engine supplier for go-peds which launched the gas power scooter genre. The basic goped for 23cc for 1.2hp but later uprated models appeared with same displacement and 2+ horsepower. 1 horsepower per 10cc is now semi-common place while maintaining nearly reasonable reliability.
My version of a Cadillac build might use a 62cc Zenoah which is around 5hp@ 7500rpm stock and weighs 5 pounds (however it's a $400 motor). Same motor can make 10+hp with aggressive porting at cost of ring/piston life.