running on three

[philwright]

Hi Folks ,After being away on hols for a couple of weeks i tried starting my slingy J last night and could only get it to run on 3 cylinders initially, culprit number 2 pot chimed in eventually after  it had warmed up properly, plug looks OK with a good fat spark (at the moment) can anyone tell me what the most likely cause is please? 

Ta.

[colinworth79]

If it was running ok a few weeks ago its possible the original vac petrol tap is leaking and then one of the carbs has flooded wetting the plug . My 750 L had a similar problem carbs off , clean and rest float heights . New plugs and a new fuel tap .