Tick / Ping on overun.

Right. i've got a random Click/Ping/Tick occuring on overun that seems to like happening at around the 3-4k mark.

I've checked everything that i thought might be loose (Filters, plates, Trumpets)

And i can't find anything that would be making the noise. TBH it sounds like it's internal :(

But i can't think what it would be ? it's a random tick that doesn't seem to be associated with revs, however i've noticed there is a fueling issue at the moment. The carbs are spitting alot and i think it's overfueling.

Another thing, one of my K&N studs sheared, which would have led to a small amount of metallic dust/shards to have entrered the intake. It doesn't appear to have done anything. And it was extreamly low on oil the other day.

do a compression check.