New Engine running - no power

a morini is a 9HP italian 50cc engine that revs to 11kRPM and goes in small dirt bikes

and a predator is a 4 stroke thumper ranging from 79cc 2.5HP to 420cc 15HP huge torque on these so higher gearing

both options are 50MPH engines if done right

Will they go on bikes like ours that take theses china girls

they both require custom mounts but yes they fit in normal bikes im going to do a 99cc or 212cc predator depends on if my friend wants my 99cc for his cart or not before i start building
there are a lot of engines you can use subaru, briggs and stratton,duromax,lifan and the list goes on and on including small ktm,kawasaki and honda motorcycle engines