Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
KXcam22:
Good,
The 55 or 58 is more reasonable for your altitude and 40:1, and it agrees with the jetting chart. Your 50 sounds waaay lean. Cam.
Hick:
I have rode my 2003 k5 in several places, different temp/humidities and elevations and haven't touched my carb since installing vforce 2, jfab reed spacer and a Dial a jet on my carb. I am happy with the performance of the dial a jet so far bike running clean and crisp. Anyone else out there try one of these yet?
atrain40:
I just checked out my jetting today since ive only had it awhile. its a 1991 kx500 with full PC exhaust and it is completely stock 168 main/60 pilot jet. i checked the plug first and it was really wet and i could tell it was running really rich. i am in california and ride mostly desert i am gonna try a 165/58 or some smaller ones as well i have to see what the dealer has. and also it does sound like its too rich, also alot of black splooge always comes out of the haeader and silencer big time. heard that is because it is running too rich and my mixing is at 32:1 but am thinking of switching to 40:1.
PowerFiend:
--- Quote from: Hillclimb#42 on April 13, 2009, 12:55:24 AM --- By the way, the 02-03 Cr 250's are very fast bikes (case/reed motor). I read an article that said they were putting out like 8hp over previous years.
--- End quote ---
The 02-07 CR250's have been consistent dyno performers, along with the KTM case reed motors, but the CR's have notoriously weak low-ends. I know, I have an 02 (eventual CR500AF donor) and an 07. They also don't have huge over-rev, but they hit like gangbusters in the mid-range.
Honda did not fully develop these motors, as proof of the success of the KTM case reed and some poor design items in the CR motor. (Large case volume, large squish clearance, etc.)
slow600:
well here is my jetting question. bike is getting harder and harder to start, espectially when motor is hot or warm. been getting worse since the temp has been going up. bike currently is at 172 main, 55 pilot, needle second from the top and air screw 2 turns out. seems like is too rich, plug looks a little fat and bike will start in one kick if new plug put in. my first instinct is to put in a smaller pilot but im always leary of going to lean. is my thought process currect or not? btw im at 1300' elevation. thanks
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