i have an fz 750cc & after fitting a new set of plugs approx 6 weeks later my No 2 & 3 cylinder plugs oil up resulting in 1 or both cylinders miss firing,even though i may be on a journey at the time i have still encountered a plug oiling up & not sparking.upon cleaning said plug, the cylinder will spark,as it should .this can happen suddenly.all sparkplugs are indicate a perfect mixture generally,but this is a reacurring problem with thisz bike.has anyone out ther had a similar problem, please help

If your cylinders 2&3 are constantly oiling up, I suggest that it is time for a strip down. You will need to replace, at the very minimum, the piston rings and valve seals.

To give it a full overhaul means new pistons and rings and new valves and guides etc.

This has probably happened because the centre cylinders run hotter than the outers and there is more wear.

Just a thought. Check all of the crankcase breathers for blockage. If the crankcase starts to pressurise then the oil will blow past the piston rings and valve guides..