Anyone encountered an occasional startup problem, starts on 3 cylinders for a short period, then clears, runs fine once on 4, done it both from cold and hot, done it on different plugs, fuel sources, weather, locations, whether sat on side stand or main, been ivanised by Mike about 15,000 miles ago, all that seems different is a slight burble on overrun, put that down to short MIVV can, running without baffle ( sounds like a Eurofighter Typhoon on reheat, when throttled up, lovely!*) any ideas, it may be one of those unsolvable things, so I'm not going to lose any sleep over it..