This sounds the same as the starting problems Iam having with my nsr, If it has not been used for a day or two it can be a bitch to start. I have fitted a new battery and plugs but still no joy, but what I have found is spraying some easy start into the lower cylinder plug hole helps and it normally starts in 2 or 3 kicks!I have even squirted a small amount of pre-mix into the barrell with a syringe and it has the same effect!I dont know why this works as I would have thought fuel not mixed with air would just foul the plug but it seems to do the trick!