My 2008 yz450f will start with 3-6 kicks when cold. When I stall it when it's hot though, it can take 7-9. It's not a big issue when I'm trail riding, but when I'm 2hrs into an enduro... It can be a chore. When hot, I pull the hot start and slowly push the kick lever until it gets firm. Then bring the lever back to the top and give it a full kick. Is there another trick to it I'm missing? My old 426f started 1st or 2nd kick no matter what. With this bike, I'm consistently one of the last riders to leave the line since I have to kick it several times to get going! I checked the valve clearances. They're all nearer the tight side, but still within spec. I also took apart the carb and cleaned it the other day. I repacked the silencer. The jetting is stock. I live at ~3500 feet, and many of my riding areas are above 5000. Could the jetting be the source of my problems? I don't have any engine mods or an aftermarket exhaust. Everything engine-wise is stock. I checked the jetting database, but there's nothing close to my elevation with a stock setup to compare to.