4 hours ago, ktm300dude said: Hi Guys, have you guys seen Dave Simon on his site ktmhusky and how he fixed yz250fx lean out condition when at low rpms and cracking open the throttle? I have a 16 yz450fx and it has the same fuel line and injector top which is crap. But i fixed it and fixed it better than ktmhusky. The stock injector has a real tight as 90 degree bend on top of it, then 4 inches or so upstream towards the tank there is another tight as 90 bend. These bends are really bad for fuel flow, especially when riding slow or cornering slow then cracking open the throttle, there is a sudden lean condition while the fuel regathers itself, which can cause stalling out. I got an engineer to make a new straight shot injector top out of stainless steel, then i got a 8mm steel fuel line off an old car, (1990 300zx nissan fairlady) and it had almost the perfect shape bends in it to suit the yz. Its difficult to explain but the fuel line has a hose tail with a barb on one end then goes like an upside down U shape with nice curvy bends then bends again towards the side of the bike and goes out to side and bends again towards back of bike and continues for about 8 inches then has a barb and hose tail which you push stock rubber fuel line onto after cutting it in correct place and hose clamping it. I used a short piece about 2inches long of 8mm rubber fuel injection line to join the injectors new straight up 8mm tail with barb, to the upside down U shape steel fuel line. The upside down U shape steel line almost touches the bottom of the airbox, which is the worst part of this mod but its ok. I was lucky to find the fuel line from the car cos it is almost perfect, it needed a few slight tweaks and minor bends here and there but i got it real good. Steel was the only solution i could see would work because of the bends, rubber will kink, so will steel braided line if you bend it 90 degrees. The finished result is nice smooth rounded bends so the fuel can flow smoothly to the injector. I have not stalled my bike at all and can chug right down low in a higher gear then crack it open and it just hauls, its how it should be from the factory. I would love to see pictures of you install.