Maintenance & Technical > KX500 Original
New Owner
95formula847:
Just looked up the jetting chart. The elevation where i live is 535 ft and its between 80-95 degress here mostly. So according to the chart i should have the N82M needle jet, the airscrew 1.5 (is this turns out from being all the way in), slowjet (pilot?) 58, needlcip in the 3rd postion ( where is the needle clip?) and a 165 main jet. I would say my jetting is way off. Mine is 52 pilot and 172 main and i havnt got the needle jet number yet.
Hillclimb#42:
The jetting chart was accurate for me, for stock pipe. Jet sizes were good. When I got the pipe Pro Circuit recomends clip adjustment to one step leaner. FMF also has jetting adjustments that are specefic to the pipe, make and model. The clip adjustment is the 1-5. 1 at the top groove 5 is the bottom. 1 is the leanest setting, 5 the richest. I use a flat countertop to remove and install the little clip. If it hits carpet or shoots off, it's gone.
When you pull the powervalve cover, you should be able to grab the deal that looks like two washers stuck together and pull the actuator rod out about an inch and a half. Thats not the exact measurement, but it should be spring loaded and not hanging up. Then you can start the bike and watch it open to that full distance when you rev the motor.
The screw with the spring wrapped around it is the idle, and the brass screw is the mixture screw also called the air screw. The idle jet is also called the slow jet.
I have 97 500, same elevation. 168,58, 2nd clip position, I am puposely a little lean, in the mids. 3rd clip is probably better for typical riding. You can check your main by plug color and performance at Top-end run. Kill the motor after sustained high rpms and pull plug to see. Pilot sounds lean compared to mine.
When you pull out the slide, down in the top of it there's a 6mm nut that holds the the needle into the slide. When re-installing be sure the white plastic keeper in the spring goes all the way back down. It has a little slot and notch thing that has to line-up. Also smash the spring with finger directly to carb cap to get the most slack in throttle cable. You have to fish the end of the cable back into slot in the nut that has to be removed to get the needle out.
I watched over someone's shoulder a hundred times probably before I felt comfortable.
95formula847:
Thanks alot for all the info man! I took off the plastic cover above the water pump and found what you were talking about. Theres a small arm going front to back and it is connected to a small cylinder that does in and out. It moves freely and smoothly and doesnt jam up at all. Comes out an inch or so. Not an exact measurement like you said. Thanks for helping me find it. So the powervalve isnt sticking. Nice! Now im gonna get the appropriate jets and start from there. Where can i buy sets of jets to swap in and out?
Hillclimb#42:
Local Dealership will have them with no shipping costs. Otherwise its standard kehin jets from anyone that has em. I like Motosport Outlet and Midwest Action Cycles, but alot of companies carry them.
Powervalve is a go, that's good. Keep us updated on your progress.
95formula847:
ok well ill start by getting the jets the chart reccomends. By then ill have the new air filter, fmf silencer, and sprocket collar/o ring on it. Hopefully it runs alittle better.
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