Maintenance & Technical > KX500 Original

Jetting!!! Again and again and again!

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Marc S:
Cam,
The compression is on the high end of the range, I have not checked the float level yet, I will do that today and get back to you.

Marc S:
Just finished checking the float level, it is at 17mm. The fuel mixture screw was out 2.5 turns but I have not tried adjusting it. When I start it up cold, I can turn the choke off right away and it will idle on it's own. When it warms up it will idle very low and then die. Sounds rich to me, is the mixture screw on air or a fuel screw? The 160 main sounds lean for sea level, cool weather and the dense air we have in the Seattle area. I did not experience the big hit in power that the rest of you talk about when it comes on the power band. The first ride was just making sure the bike performed well after the engine and suspension rebuild and to give myself some seat time. Now it's time to find somemore power.

Thanks,
Marc

KXcam22:
Marc,
  Sounds like you know what you are doing.  I run a 165 at 2500' (1992 K5) so your 160 does sound lean.  My favorite procedure is to get your main about right, then find a pilot that will give you a nice idle.  After that you play with the needle but most of the adjustments are based on "feel" and "sound" more than anything.  Then you check the main again to see if its still ok.  I would suggest picking your main from the chart as a starting point then doing a couple of plug runs to verify it.  Might find your lost power.  Your needle sounds about right. Mixture screw is air so more air (screw ccw out) leans the jetting.  Remember to only change one thing at a time.  Also check to make sure your bike has an 8 heat range plug. A colder plug will give you incorrect readings. I have great luck using a BPR8ES.  The projected nose plug runs clean and they are cheap and last.  The BR8EIX is the best plug but has a much higher cost.  If you need to find smaller pilots, KTM's & older CR500s use 38 and smaller. Good Luck. Cam.

doordie:
Hi guys!

I need some help with my jetneedles to convert them to new standard letters.

1)N89B :?

2)R1366 :?

What?s difference(leaner/richer) to stock needle N82M?

Thx in advance :wink:

Doordie

jigggawatt:
jetting that works best with my bike. Stock needle second clip, 48 pilot and 165 main , pro circuit 296 sil. fmf pipe,reed spacer, thick head gasket,3800 feet . I could even get away with a 162 main . I like it a little rich. The 296 really chages what jet the bike wants.

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