Just to add detail to this thread, here are four different Chondas copied from the Honda GXV160:
If your Chonda happens to be 163 cc you might recognise it among these, each of which seems to come from a different manufacturer. These and other manufacturers also build some of the other Honda engines, both horizontal and vertical crankshaft, various capacities, etc. At the moment I think visual identification may be the most practical way of figuring out who made your engine, which is usually the first step toward trying to get hold of an owner manual, or even perhaps a parts list.
In case anyone cares, my Chonda is a Rato RV160, and it is on a Ryobi RPW2400 pressure washer. I do not think Ryobi made any part of the machine themselves. And yes, I did manage to find an owner manual for the engine, but not a parts list so far. As far as I can tell, nobody sells the parts anyway, so perhaps that doesn't matter.