Maintenance & Technical > KX500 Original
does any one on here ride above 6000'?
KXcam22:
Kix,
Beause of your high elevation you are going to end up with jetting that is quite a bit leaner than most other riders on this site. You must keep this in mind since if you go on a ride trip to a much lower elevation (dunes somehwere else etc) you would have to rejet richer so as not to seize your engine. Also keep in mind to do one change at a time so you can tell if you are going in the right direction (or not). Here's what I suggest you look at:
Compression: For your elevation you will need to increase compression. You should be able to set your squish band clearance to the minimum (search Doordies posts for the exact clearance, I think it is 1.3mm but better check he knows) with an alternate thinner Kaw head gasket (Check cometic too). An easy way to measure is to bend a section of plumbing solder so it fits down the plug hole and up against the cylinder wall (where the squish is important) and kick over the engine slowly to flatten the solder. Mic it and that is your squish. I would suggest that your buddies CR500 has had his compression bumped.
Now to jetting: For a start stick with the 55 pilot and 162 main, it should be close. I run 58/165 which is nice 2000-5000 but starts to get noticeably rich above 6000 - that tells me you are in the ballpark. Ran a 55 for a while but it got too lean when riding in snow. For a first test you might want to drop your needle (stock N82M) all the way down and see how it responds. My recomendation would be to stick with the 55/162 and we need to find you a leaner needle that works. At my elevation the stock needle all the way down is a bit too rich so it must be quite rich for you. Kaw has leaner option needles or Sudco is a better source. For needles, my rule of thumb is to go down 2 sizes then test. Needles are cheap (at Sudco anyway) so it may speed things up to buy the next leaner 3 or 4 sizes, but still start at 2 leaner for testing.
Flywheel Weight: It will slow down the engine in a drag race, but if you hill climb or ride gnarly single track hills your bike will rule. If you can measure the dimentions of the added weight we can calulate the weight it adds. It sounds like home made one from the previous owner. It could possibly be way too heavy (a Steahly is 16 oz). I had a friend who made his 32oz.
For a first test stick with 55/162 and drop the needle all the way and see how it runs. Possibly do a 1/2 throttle plug run (use tape on the throttle for the 1/2 mark) and post the result. The procedure is usually seat of the pants testing until you get close then start doing a few plug runs a different throttle settings. It is fairly easy to tell the diff between ratty (rich -won't rev out cleanly) and flat (lean). Let me know how it turns out. Hope this helps. Cam.
kix500:
could someone give me the sudco part numbers for the next two leaner needles than stock for my 97 kx 5 i cant find a cross chart anywhere?
cory
Arigato:
--- Quote from: KXcam22 on May 11, 2006, 04:22:18 PM ---
Flywheel Weight: It will slow down the engine in a drag race, but if you hill climb or ride gnarly single track hills your bike will rule. If you can measure the dimentions of the added weight we can calulate the weight it adds. It sounds like home made one from the previous owner. It could possibly be way too heavy (a Steahly is 16 oz). I had a friend who made his 32oz.
--- End quote ---
Keep in mind that the flywheel weight only helps in hillclimbing when it's technical stuff.
For racing up a sand dune, it will hold you back. KXcam hit the nail on the head about the compression. Bump it up.
kix500:
i just took my bike out yesterday for a long ride left the needle in the #2 slot didn't have time to change it pulled the plug bout 30 min into our ride makeing sure not to go above 1/2 throttle. the plug was clean all exept the electrod and the porcilin were black so i need to go leaner like you said cam. if some one could give me the next two sizes leaner numbers on the needle i will buy some. i can't find the sudo numbers. any help?
thanks guys
cory
Rick:
been awhile since I posted, sob thought I would jump in. what is your gearing? are you getting beat at top speed or from corner to corner?
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