This is an amazing kit. Super-size base transfers leading into a six port cylinder transfer design with a "W" bridged exhaust port, for high performance and decreased chance of ring wear/breakage.
This Aluminum/nikasil cylinder kit will really tear up the road. Polini rates this kit at 7.3HP, compared to the 6.2HP of the Puch Polini kit.
This cylinder is meant to be fit on a AV10 motor, which is the crankcase inducted reed valve engine that came on motobecane mopeds in Europe after they ceased exporting them to the states.