Jetting for 2007 kx450f in Denver Colorado 5280 elevation

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12/10/2017 10:47 PM

Looking for help with jetting, I’ve been getting different opinions. My bike is stock besides Jemco exhaust system, rd bowl with adjustable leak jet. When I removed carb I found a 45 pilot, 175 main , and 1 1/2 turns out on fuel screw, but when I turned fuel screw all the way in the bike didn’t stall so I changed to a 42 pilot ( still no change) then I change to 40 and some change. I then purchased the jd jetting kit and they said put red needle in with 178 main. I’m confused because someone else with the same bike on another forum living in Colorado said that they are using 172 main 42 pilot . Can I get some help please thanks in advance.


12/11/2017 12:01 AM

220 or 221 What ever it takes !


12/11/2017 8:41 AM