Hey peeps,I'm new on thumper but i have been reading as guest for long time.My problem is, it almost never wanna start...This is what i did till now.New spark plug.(it sparks)Valves adjustement.Cleaned air filter.New oil filter and oil.Fuel filter installed between tank and carb.pilot jet from 52->45Fuel screw 1,5 turns outI am really getting pissed about it because i cant find the problem.I hope you guys can help me. I owned a 2001 and I had the same problem search on you tube on how to start them. That's a big reason why yamaha stop making those bikes because the were a bitch to kick when cold and hot. In motocross they were good bikes until u stalled them and that was it, your race was done unless u get lucky and it starts up again on first kick and there has to a miracle for that to happen. It left me stranded out in the desert a couple times because when I shut the bike off to take a break the bike wouldn't start up again when hot I even used the hot key switch still didn't work but the bike ran like a raped ape when it was running. I ended up selling it because of the problem, I got tired of it now I have crf450 and its great and a lot more power so good luck with yours I heard you could put a hot cam for the intake its about $150 to fix the problem but heard it doesn't thats an option if u haven't already done it. They're reliable bikes when they are running ill give them that.