Maintenance & Technical > KX500 Original

Idle Dies Down

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jdv500:
my 01 500 will pulse and surge by itself evrytime i let the throttle go after a straight and level run,
with the gas shut and rolling, the revs will bounce up 3 or 4 little peaks and the bike will surge forward in sequence. any help would be great thanks.!! jdv

rradar:
Tom, After trying everything, plugs, all jets, oils, ratios, etc. I finally made my own Idle Screw just a few threads longer than stock and shaped the end on my bench grinder-like the stock screw. Idles nice, I can adjust it a lot better now. It doesn't surge and runs clean due to all of the jetting. I run Maxima Super M at 40:1 with a BR7EVX and 92 Octane Pump.
Rick K.

doordie:
John,
Good for you with the rebuilt and you don?t need 2 gasket, I promise!
(The moose is something around 10mm)

//doordie

KXcam22:
Joseph,
  Unfortunately, that surging seems to be quite normal when the jettting is good.  Mine does it just like you describe, maybe worse.  Gowen did a lot of testing and the surging only seems to go away when you are too rich.  I doesn't bother me when I ride so I have got used to it. Probably not the answer you were looking for. Cam.

jdv500:
yeah,
 i often relying on the engine braking and during this is when i feel it . thanks, jdv

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