Note I don't mean flushing out the cooling system, I mean the actual block.
I've got an air-cooled Yamaha XS400 engine whose cam shaft sprocket and chain got chewed up. In taking the cam out, I saw you can see right down to the crank (the timing chain is in the middle of this engine between the 2 cylinders). I was thinking it might be good to flush out the engine of any possible metal shards or remnants, pouring liquid in from the top between the cylinders and draining it out the sump plug.
Does anyone know if theres a product or right chemical to do this?