I have a 2013 crf450x that I'm having trouble tuning. I don't get a stumble when I turn the fuel screw all the way in I just get higher revs.
I've recently put a jd kit in with a 170 main, red needle 4th clip and a 48 pilot.
The air box is cut open and it came with a s3 slip on exhaust. I'm pretty much at sea level (Sydney australia)
Before the jd kit the bike was popping on decel but now it runs amazing with the fuel screw at 1.5 - 2 turns out.
Does anyone know why the fuel screw isn't getting a stumble?
Thanks!