Maintenance & Technical > KX500 Original

Jetting!!! Again and again and again!

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gowen:
Zert, sorry. I thought that might be the case but had to give the idea out eitherway. I also keep mine shut. I figured if I perfected the jetting it with them close, there is no need to open.

zert:
update

Today i put the clip on the needle on the top position, air screw 2.5 turns open and i went for a ride.The respons was very good but still doesn't idle.When i came home,i checked my plug and it was grey/white(too lean but i think that because my main is to smal).So,i ordered a stock needle but i have to wait because here in belgium you have to wait for everyting.I let you guys know how it went.
regards,wim

alan:
So what happens when you bump up the idle stop?

Johnniespeed:
Hello everyone. This topic on jetting seems to get beat to death, but it is vital to great performance. So after a couple of years of seat of the pants "dyno testing" I thought I would share what currently works best for me.
  Klotx R-50 mixed 40-1 with premium fuel, BR7ES plug, stock reeds with moose reed spacer.
 FMF Gnarly pipe, stock bore and ports. I live at 760 feet above sea level.
  I have the air screw at 1.5 turns out, my pilot jet is a #45 that I drilled to #46.5  (48 too rich)  stock n82n needle on second clip and 168 main jet.
  The bike starts cold on second or third kick every time. When warm or hot it starts on first kick almost always. It idles smooth and  accelerates cleanly at low speeds. The throttle can be snapped open at any time and it will try to tear your arms off.
 This is, and has been, a work in progess, I have put, as of this week, two hundred and forty gallons of fuel through this bike since it was new two years ago. I feel as though, I have it right, and am very happy with the performance. Now if my riding would improve that would be better.
  KX 500 is the best.  Johnniespeed

gowen:
That's excellent to hear.. It is a topic that has been beaten to death.. But, I'd say about 90% of the KX500's out there are running at about 60-70% due to the jetting. Most people I've talked to around here that had one at some point in life have all said that they foul plugs and are hard to start and just smoke too much... Which is all due to jetting..

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