Maintenance & Technical > KX500 Original

01-500, eng surges/pulses after run.

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jdv500:
john ,
no problem, i've seen within this site that there are 1 or 2 guys that have never even heard of this run-on surging thing in their 500's,  nor did they know what the fuss was about. we love this bike and for me, i'll keep it forever or even get another to add to my arsenal.
earlier, you said that you prefer no idle,, i think that i know why this is,you use it for engine braking/decel.? also you said that you ride the 5 on tarmac.. where and when do's the surging happen out there, if ever.?, jdv

John:
Jdv,

Same problem there - after full throttle a hard brake. With the grip on tarmac it is more noticeable; as in using the clutch not to loose the optimal track.

I am used to it but my friends are not. They usually just try my bike once.

//John

KXcam22:
John,
  Yea I could believe that on tarmac the surge would be a bit of a bother, especially if you were leaned way over (dragging a knee?) decelerating into a corner.  Maybe a good reason to try a PJ.  I had one on an '87 CR500.  It worked very well with a similar engine and intake to the KX. Cam.

demographic:

--- Quote from: John ---I am used to it but my friends are not. They usually just try my bike once.

//John
--- End quote ---


Aye, mine does it and the mate that I have let ride it hates the couple of Brang Tangs it gives out :lol:

I Ride mine on Tarmac but prefer it to idle as it pisses me off having to blip the throttle in trafic (especially if there is a police car about as they give the bike FAR too much attention as it is) cos it's a bit too loud.

doordie:
Oki guys, I maybe have the solutions for the problem! : :wink:

This is my teory: :idea:

I think this is a KIPS problem. :shock:  :shock:
Every KX-cylinder I have tuned they all (1989-2004) have a problem with KIPS.
Either with opening or closing or both.
The opening it?s no problem with shims and new parts, but the closing.....
I have found out that KIPS is OVER-closed because of to short stopbolt(92066)
for the rod(49046) who is moving the KIPS.
When the rod moves too far back at low rpm, it?s opening the sub exhaustports
and let some "new" fresh air/fuel in exhaustchamber and it
ignite there,it?s VERY warm exhausts(600*) there.
I have no problem with surges/pulses, I always"take care"
of this KIPS problem.I put in a old steel bearingball and shims(92065) the stopbolt(92066) to right distance. :wink:
You have to take away your pipe and SEE (use flashlight) inside exhaustport how much distance you have to adjust.
And one more benifit it`s more lowend power because of right porttimes when the sub exhaustports isn`t engage at wrong time :twisted:

IF you think I`m right here and you ALL people fix your problems with surges/pulses ,please send a little money($$) to PAUL(admin) so he can afford to
have this site still going! :wink:
(you can read about this in old post)

//doordie

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