Mine sounds like a bit of an agricultural mulching/thrashing machine but only after a hot startup. It seems pretty clear who to blame...... Mr CCT!
Next timing mod I'll inspect it/replace it. <20,000 miles.
At 20,000 miles adjusted valves... All noises gone! Hot start noises that sounded like chain noise are gone.
Keep in mind that evenly loading the chain by having the valves adjusted properly reduces the work the cct has to do.