Welcome to the forum. The HF 79cc Predator is a DIY build. There is no kit for it.
If its your first motorbike build, I would go with an engine kit with a 49cc Huasheng thumper.
SBP can supply a jackshaft/shift kit for the HS and they have plenty of experience.
-If you have skills and still want to install a 79cc, check out our "non-kit DIY" sub-forum on this site. Plenty of 79cc build threads there.