Hi I've owned my lupo for nearly 4 years and had almost every problem possible and recently rubuilt my engine all was well for about 2k then a random tapping started to occur from the head spoke to loads of mechs who assured me it would be the tappets so I set to replaing them to find out when I started it that it still tapped just wondered if anyone had ever come across this before as I'm now at a dead end and just don't know what to do any help would be very apreciated Thanks ben