Also, not knowing a thing about this 225, My imagination added these;
7) Someone put a hydraulic cam & tappet set in there, & kept the mech adjustable rockers & pushrods, not knowing it don't work that way on a Slanty. Noisy collapsed lifters with a bunch of lash trying to toss a pushrod.
8) The lash is just plain F'd up by somebody that hasn't a clue of what they're doing.