First thing to do if you haven't already is change the oil and filter before running the engine again.
My curvy had a slight ticking on the top-end,not as excessive as yours.I used a bit of Moly in my oil and use Smith&Allen engine oil,
https://www.smithandallan.com/produc...emi-synthetic/
£19 delivered to your door.Fantastic stuff and a good price for a proper gallon.