Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
FuriouSly:
Hey there raredesign, most likely air leak at carb boot/reed cage.
Check:
Gasket between reed block to cylinder/reed block to air boot. (if you have a VForce check the modified i.e. hand cut/shaved, surface for incorrect fit to air boot)
Carb boot for cracks/clamp tightness.
Stator side crank seal.
..... you can use an ether/WD40 type aerosol spray and mist near those items above and see if the bikes idle/low RPM is effected (surge/stall)..... can be explosive on the stator area, so use at own risk :roll:
This can definately be old/stock/incorrect reeds. You can flip the ones over that you have and see if that helps also. That will put the reed petals that may be slightly flexed outward and weak at high RPM's from age/use more tightly against the cage.
Sly
raredesign:
Thanks for the suggestions!
Maybe I can post some pics of the carb boot if that is what you call it...going from the air box to the carb is what concerns me.
If you look at the carb, where the boot fits on and clamps...right at the edge of the boot the carb has a lip, or ring on that lip. the left side (carb side) has the boot pulled right up onto that lip ring (unless there is a better name), while the right side goes just before the lip ring. I tried squeezing the air box, and negotiating with it as much as i could, but it just doesn't seem to want to fit right.
The other thing that I am wondering, is that the guy I bought it from, had placed a torque spacer (if that is what it is called) for the reeds. He also used different reeds I think, maybe moose, but not certain.
raredesign:
I went out yesterday and the strangest thing happend; gas started pouring out of the overflow tubes! I had gone from full tank to half tank in 5 minutes! My buddy and I opened up the carb on the trail, and the float had been set wrong! When all the way up, it was not pushing the stopper all the way (sorry I don't know the technical name for it), so the gas just poured out. We bent it a bit more, start up the bike, and the bike runs like a champ. I was too excited to pay attention to the surging though...not sure. I am just glad that I can ride for more than 10 minutes ;-)
KXcam22:
Rare,
Welcome to the jetting place. Take the time to set your float, there are some easy procedures in this thread. The float level affects jetting so it is important to set it right before you take the time to jet. I run mine a touch low so I don't lose as much gas from the overflows over rough ground. As for the surging, mine is likely the worst offender but I rarely notice it. The only KX500's that don't surge are the ones jetted too rich. We always joke that as soon as you bike starts to surge you know that your jetting is getting close, but it is very true. It is easy to adapt your riding style so that you don't chop the throttle as much then it is not an issue. Hope this helps. Cam.
kix500:
could somebody give me a good start point to jet for 6000'-8500' ii tried the jetting chart and seems to rich. what is happening is, the bike seems to run ok as long as you are on the gas but if you idle down a tight trail for a couple blocks to a mile the bike will die unless you keep reving it. then when you come to a rock or stump or something and try to blip over it the bike bogs. i have tried a smaller pilot but dosn't seem to have the botom power when it is cleaned out. the bike is a 97 kx 500. with a platnum pipe boysen reeds and milled head.
current jetting is i think.
air 2.5 turns
pilot 55 or 52?
needle stock 82m? can't remember the number but its stock. top clip pos
main is a 165 or 158??
it has been a couple months since i been in the carb, i will go check for sure tomarrow.
srry i daon't have all my info for sure.
thanks
cory
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