Very odd pickle my bike is in, the xv250, she wont fire over no more, it will crank over and all, but firing up is just not happening, here is how it happened, was going to work one night, and I had her idling away as you do, so I decide to give it a bit of throttle, which than resulted in it almost cutting out...strange I thought, so I did it again, same thing, in fact I couldn't use the throttle at all with out it possibly cutting out, so I let it be for a few moments, and I tried again, it than cut out. The more I tried, the worst it got, until it didn't want to fire over again! I check fuel, its alright, no amount of dicking with the fuel tap helped, how ever when I took the plugs out and gave em a good clean with some kero, it fired up again and stayed idle for about...10 seconds than cut off again, how ever it did improve when I cleaned the plugs some what, think this could be just some bad plugs? there relatively new, and the bike has been runing soundly with no syptoms of any problems, so it has me baffled. Cheers.