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626 Posts
This could be a symptom caused by the "black" spark plug you mentioned. I have had my 1098 cut to running on one cylinder due to too many cold starts without riding anywhere. It is due to too much soot on the plug insulator which shorts the plug to ground and stops one cylinder from firing. The easy test for this is after the engine dies or even just after 10-20 sec running lick your finger and dab it on the header pipe. If it sizzles on one and not the other the non sizzling one is not firing the spark plug. The engine also does not idle well if at all in this state. If you run it too long like this you will be able to see the cats in the exhaust glowing unusually brightly.Yes it does and all relays are new ..the priming sound is loud and clear;
Might be worth a shot to mention that when it does start it runs rough and you have to sliiiightly keep pressure on the throttle tube to keep it idling and if I can hold it there and make it reach op temp (40C) it then slowly dies like you emptied the bowls on a carbureted bike