thanks, I have had similar thoughts, so tonight I have stripped the head off in case the piston is hitting the head. Its not thank goodness, I was a bit worried I only fitted a single ali shim to the head. The noise is engine speed and doesn’t quieten down with the clutch in. Piston and bore look fine also. It doesn’t sound like a little end rattle.
Another thing for the Mz experts. I am ready for an MOT, except when I switch from dipped to main beam it kills the light and the engine. Dead short presumably. Could this be a bulb issue? The light switch doesn’t appear to have any shorts in it, and I presume there is only one driving coil for the main and dip.
Any help appreciated