I put a clutch disc in backwards once on an old Mazda years ago..what a terrible grinding sound. I had to pull the disc and replace it. It ground the springs right down and I didn’t trust the disc after that. If that engine is running and you get lots of constant grinding... I second sstock’s suggestion. I’d check the clutch to be sure. PITA but you’ll rest easier.
What did you do with the pto? Did you reinstall it? Put on a cover? Could something be touching in this area?
My 420 top install went very smoothly. It seemed to me that it would only go together if you had it in the right position. Keep trying and asking questions. You’ll get it.
