gapping

Hi all, Im getting a jerk and slipping when the supercharger engages, ive checked the gapping and its well out. Its now down to 510mm with no shims, does anyone know which part i need to replace at bring the gapping into spec 035 to 042mm ? I take it i have a wron clutch, the car has a...

Hi, Purhased 12 new NGK IFR6D10 plugs for my SLK32 and hopefully going to fit them tomz. Went to check the gaps on the plugs but i'm dammed if i can find what the gap should be in owners manual. I know they suposed to come preset but would like to check prior to fitting them. Also is there a...