I'd like to think I'm pretty proficient with the search option but I couldn't find anything quite like this. So a little background I just picked up a 2000 yz426 it looks like a 2000 leftover no scratches on the cases no paint off the frame and chalk marks on the tires the bike had been stored for around four years after being ridden "5 times" the gas in the tank was drained for storage but fuel was left in the carb the guy says he cleaned out the carb and when i removed the bowl there was no trash or residue. The bike has hinson clutch components a white bros head pipe and e series exhaust. Now the problem, I meet the seller get on the bike and use the standard starting technique recommended by yamaha/most posts I had read here to my suprise it started on the first kick. I pay the guy get the bike home and warm it up run it up and down the alley behind my house it ran great. The next morning i was going to go riding I try to start it and nothing so after working up a sweat i decide the plug is probably fouled. I go get another plug pull the old one (it was sooted up) I'd been kicking/pulling the plug for almost a day with nothing more than a 2 second idle before cutting off. A good friend of mine shows up and kicks it once it fires and runs!! he hits the engine stop button and says"so whats your problem" well he soon learned as we have not been able to get it running again even after replacing the plug. The only thing i have changed is the idle setting after reading posts about the idle affecting starting but I've tried starting at many idle positions and i would think that it would still start as long as the idle is somewhere close. I've checked the spark and its there and its getting fuel. I love the bike its the cleanest 2000 I think I've ever seen but I'd rather be getting it dirty instead of looking at it sitting on a stand......any suggestions???