Um – er - (headscratch) – fellow LMLer’s – since the annual 
  performed by maintenance outfit (not necessarily significant) I notice I get a 
  drop around 80 RPM on the Lightspeed ignition during run-up, whereas before it 
  was barely noticeable.
   
  Been wondering why. Changed my iridium plugs two days ago 
  just as a starting point but no difference.
   
  So thought I would ask the experts herein.
   
  Thanks
   
  Dom Crain
  VH-CZJ