Maintenance & Technical > KX500 Original

Idle Kick-Backs v.II

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kawdude:
I recently went thru and rebuilt the KX engine from top to bottom.  Fired her up today and it really runs good except for the infamous idle kick backs, surges, popping...whatever you want to call it.

To research this issue I have done numerous searches that have yielded excellent info but the following lays it out well.

In reading the following post...
http://www.pitbull-racing.com/index.php
name=PNphpBB2&file=viewtopic&t=375

I have impression that switching out the carb seems to fix the problem.  I did that and the problem is still there after the rebuild which surprises me.  I would have thought something would be different with this issue.

Currently jetting is 168m, 55s, needle on middle clip.  Seals are brand new.  No air leaks that I can tell.  I have attempted some of the mentioned fixes on top of switching out the carb but nothing seems to make it better or worse but at least the bike actually idles.

Has anyone else suffered the same and found any other solutions?

Woody223:
What do your reeds look like?

I had a similar problem on my KX5 and the reeds were a little worn, they did not close all the way as they were old and starting to get brittle. I changed from fiberglass Boyensen reeds to carbon fiber and it helped alot. Most of the surging is now gone but it takes a little more time to "pick up" than it did with the glass reeds.

Woody223

gowen:
I switched to c12 fuel instead of 93 pump and it fixed about 80% of the the poping and 100% of the surging.

kawdude:
Originally the problem started or was intensified  when I added a Steahly and moose space at the same time last year.

kawdude:
Why would changing the fuel help?  Different O2 level???

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