I have a PRD engine, 100cc air-cooled, not sure the exact model or year.
Does anyone know if these things are close in class to an HPV or KPV? all’s I know is it has a Yamaha crankshaft, because it has that taper and we used to run it in piston port sprint a while back. I’ve never take it apart because it still runs fine mechanically.
I’m trying to build a dual engine laydown , piston port, and I’m trying to figure out if it’s close to a Piston Valve motor?