Hi dg147
Mine were completely shot on the 147 2.0 after 30,000 mixed miles from new.Comparing them with the replacements,the gaps were bigger and the electrodes ragged and lumpy.All on V-Power,too.Fairly white(ish)electrodes,rust on some hexes and number two cylinder was firing through an oil bath(it was serviced at a dealer in its warranty period...)They were in a much worse condition than on my previous 156 but that was garaged daily and used for long runs only.The 147 now runs like silk after TLC and new NGK plugs-£60+ from Partsworld.Get them changed and with some lovely new Selenia in its sump,fresh Tutela in the brake circuit,if the fluid is more than two years old and don't forget to bleed the clutch(it made a huge difference to an already slick change for me)it should feel like a young'un again.You cyclists know-strict regimen and diet,good kit and you are ready to fly.I'll get back to you on the mpg improvement in a month or so,as the freezing weather is beggaring up my carbon footprint.
) want to risk a failure / breakdown before changing them? They are due, change them 
