Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
Good:
Gonna test more today :-D but it's raining so might not be accurate due to humidity.
Currently in the bike,
50 pilot
160 main
stock needle in the second slot from the short, or fat, end
Going to mix Maxima Super M (because I have some left, but normally use Amsoil) at 40:1 in 91 octane.
Upon messing with the air screw and the idle screw, I can get the idle surges to go away, but then it doesn't want to idle when it finally calms down. I ran out of fuel after that last vid. Getting more today.
I'm also gonna adjust my float like Cam did due to losing fuel at a slight lean.
After riding an '02 CR250 all last Saturday, I'll say my low end torque and responsiveness is WAY more on the K5, but the CR pipe kills my bike. Down low though and responsiveness, my K5 owns. But, on the pipe, that stock 250 runs like a scalded cat. That's what I'm looking for, but times 10!!! :evil: (and why I bought the mighty K5 in the first place.)
Thanks for all your help. I think eventually I need to take apart my KIPS valve... :|
KXcam22:
Good,
It is a goodpractise when jetting to keep all outside variables constant. The humidity I never worry about too much but plug heat range, fuel/oil brand and ratio and float level should be kept the same. Can you get higher octane gas in your area without resorting to race gas? 92 or 94 would be better. 91 might be ok I have just never run it since I get 94 at the pump. I am concerned that the 160 might be lean. I would suggest doing a few plug chops to make sure it is ok before riding lots. Your KX should eat an 02 CR250 in every power range. I rode one of those back to back with my K5 as the owner was boasting about how much low end power it made. Not much by K5 standards. What pipe do you have on your K5? Cam.
Hillclimb#42:
Good, your original plan of 165, 55 was pretty solid, like KxCam is saying. Dealerships are bad about changing a gameplan due to out of stock parts. You probably should order that 165 main and 55, if they don't stock them. Too lean makes for a short engine life-span, and you are leaving power on the table. A plug chop is referring to holding the throttle at a position for a given period of time and then killing the motor. You check the plug color to see how the plug is colored. You are supposed to use a new plug each time and start with the main jet check. Start with stock or slightly richer than recommended by the jetting chart. (The jetting chart was right on the money for mine.) It was just a needle adjustment and mixture tweek to add a PC pipe and V-Force reeds. FMF gives a jetting recommendation for specefic models and years for which pipe, on their website. Its hard to jet a bike with worn reeds, by the way. They should have a good seal around the edges, where no light is leaking through, if you hold them up and try to look through.
Once you have your jets right, the needle is a big time adjustment for the mid thru top. It helps make your acceleration steady, when set right. Mixture screw is the tweek for condition and controls from idle to mids. Start with stock setting there too, and tweek for good throttle response. On my bike the idle adjustment seemed to cause alot of the over rev. Once I got the jetting and mixture right, the idle screw barely engages the slide. It idles fine, when cold, in neutral. Sometimes when warm, in gear, it wants to die because of the added drag, but still idles in neutral, warm or not. I run a 168 main and a 58 pilot, at a lower elevation, but I'm guessin' yours is way past compensating for the altitude. Starting a little rich( plug is dark) is perfect, no danger. Go one step leaner check again, till its brown/tan. Starting off on the lean side(green/white) is the risky way, expensive way.
martinfan30:
--- Quote from: Hillclimb#42 on April 11, 2009, 07:05:44 AM ---Good, your original plan of 165, 55 was pretty solid, like KxCam is saying. Dealerships are bad about changing a gameplan due to out of stock parts. You probably should order that 165 main and 55, if they don't stock them. Too lean makes for a short engine life-span, and you are leaving power on the table. A plug chop is referring to holding the throttle at a position for a given period of time and then killing the motor. You check the plug color to see how the plug is colored. You are supposed to use a new plug each time and start with the main jet check. Start with stock or slightly richer than recommended by the jetting chart. (The jetting chart was right on the money for mine.) It was just a needle adjustment and mixture tweek to add a PC pipe and V-Force reeds. FMF gives a jetting recommendation for specefic models and years for which pipe, on their website. Its hard to jet a bike with worn reeds, by the way. They should have a good seal around the edges, where no light is leaking through, if you hold them up and try to look through.
Once you have your jets right, the needle is a big time adjustment for the mid thru top. It helps make your acceleration steady, when set right. Mixture screw is the tweek for condition and controls from idle to mids. Start with stock setting there too, and tweek for good throttle response. On my bike the idle adjustment seemed to cause alot of the over rev. Once I got the jetting and mixture right, the idle screw barely engages the slide. It idles fine, when cold, in neutral. Sometimes when warm, in gear, it wants to die because of the added drag, but still idles in neutral, warm or not. I run a 168 main and a 58 pilot, at a lower elevation, but I'm guessin' yours is way past compensating for the altitude. Starting a little rich( plug is dark) is perfect, no danger. Go one step leaner check again, till its brown/tan. Starting off on the lean side(green/white) is the risky way, expensive way.
--- End quote ---
Can I ask what your final needle set up is?
Hillclimb#42:
Mine is as Pro Circuit recommends, 1 step leaner than stock, for the needle setting. I had to fatten my mixture when i added the V-force, and may still be a little lean through the mid, but have not had much seat time on the 500 to tell. I liked the jetting chart, when I was stock, the Pipe manufacturer's suggestion once I got the PcII, and the V-force cleaned up the rest. Plug looked good on the last ride, but it was not a normal summer day. I am confident I am very close.
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