Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
gowen:
Cam, the 1/8th to 1/4th is very close to smooth. As for the needle, I'll give it a shot tomarrow evening. Your help is VERY appreciated. Also, did you fire yours up to see how it sounded? Just curious.
Kawdude, this is what I'm at right now:
Air screw: 2 turns
Pilot: 38
Needle: CGK (larger diameter)
Needle Clip: 3rd
Main Jet: 155
I'm assuming that your bike is going to get VERY close to mine. Cam is the man for the problem you are having with the surges. It sounds like you need to richen the needle and then fix the powerless problem with the main jet (leaning it out). I'm betting you are going to be close to the same jetting I'm at. But, I know every bike is going to be diffrent. Keep us updated and thanks for all your input!!
KXcam22:
Gabe,
On your 1/8 to 1/4 throttle resonse, is it a bit ratty (not clean feeling) or does it hesitate a teeny bit? I would say that the desired response should be sort of a controlled dial-a-wheelie, lots of power very smooth and controllable (although I guess the EGore porting might influence that). I guess I am wondering if you might be a tad lean on the 1/8 to 1/4 area. That test with the next richer needle should show it that's the case or not. For the next couple of tests I'd say try the CGK raised 1 notch to richen the 1/2 to 3/4 area. Then try the next richer needle lowered 1 or 2 notches from center to richen the 1/4 to 1/2 while leaving the 3/4 to full about the same. Check your throttle response and see if your surging changes. Let me know how you make out. Once we get your bike working perfect we can gang up on Kawadude and get his dialed. Cam.
KXcam22:
Gabe,
I fired my bike up last night but then dogs started barking, babies started crying and wife started yelling. Will try again tonight. Cam.
gowen:
--- Quote from: KXcam22 ---Gabe,
I fired my bike up last night but then dogs started barking, babies started crying and wife started yelling. Will try again tonight. Cam.
--- End quote ---
:shock: Opps! Sorry about that. Didn't mean to get you in trouble.
I'll give those needles a shot.
Should I order the next needle down Cam? I have a CGH, CGK, and CGL. Should I get a CGJ?
Dial-a-wheelie. Boy, I love it when the doctor orders wheelies. :D My 1/8th to 1/4th does not have much power. But, I'm thinking RPM's. Cam, I will have to get back about that one. I'm not sure. I will tell you that my KX does have a mid-over rev porting. So, it does not hit hard until close to the top. Question though, I did have the timing retarted. (just to the retard notch) would that have made a diffrence? I believe retarding is to the right or clockwise notch.
Thanks Cam, I will get back about the 1/8th dealy.
KXcam22:
Gabe,
Since the price and response from Sudco is so good, it might be a good idea to get the CGJ. My thinking is that you might be a bit lean in the 1/4 area hence the lack of low power. I'm guessing that you will find you have a bit of a flat spot and that it may even be contributing to the surge symptoms. Even with your porting a 500 with a powervalve should still have a heck of a great bottom end. I believe retarded timing should help the bottom end too. While you are waiting for the CGJ needle, try the CGK raised 1 notch to richen the 1/2 to 3/4 area and see how the upper end response is. If you have the time it might not hurt to try the 40 pilot back for one run and see if you still get an idle, and better yet a 1/8 to 1/4 improvement. The 38 is probably the way to go but since you have the 40 it wouldn't hurt to try it with the leaner needle and see what happens. Have fun. Cam.
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