Originally posted by USAF
The zenoah 23cc engine has around 2hp not 5hp.
That depends on what has been done to it. And we don't know if this is a stock engine or not.
STOCK Zenoahs on bad pipes run 2HP. Change pistons, pipes, fuel, carbs and you can easily get them past 8HP. There is a kit to change the "innards" and have the engine pushing 5HP for only $159.99
Big boat guys have done this a lot and rocket their boats past 95mph regularly.