u/ChaoticMonkiss

Hi! I’ve been working on my motorcycle and suddenly it’s developed this knocking sound. One of my spark plug wires seems to be at the end of its life, so maybe it’s running on three cylinders but I’m not sure. Cam chain tensioner has been checked, so that should be good.

I’ve also worked on the exhaust manifold, and from one of the cylinders I get a bit of white smoke at idle, but not when I rev higher. The noise also disappears at higher revs.

Any idea what this could be?

Thanks!