Can a harbor freight predator 212 cc engine be enough for an ultralight Hi I am planing on building a budget ultralight and I was wondering if a 6.5 hp 212 cc predator motor will be enough and if so what size prop should I use.

A little background, it is going to be a wood and foam plane with fiberglass covering I am going to have a few bits and pieces of aluminum for strength. I don’t have a plan yet because I am going to plan it around the engine. I am shooting for 160 pounds dry. Thank you in advance.
6.5 hp is enough to get a person off the ground - but it would require an extremely aerodynamically- and structurally- efficient airframe to do so. A first-time builder without experience or training is not going to build such an airframe on the cheap from wood and foam and fiberglass with "bits and pieces of aluminum for strength". Either the wings will break and you'll kill yourself, or more likely it just won't get airborne.

You should scrap this idea and instead find a good set of plans and follow them exactly.