Maintenance & Technical > KX500 Original

01-500, eng surges/pulses after run.

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jdv500:
HELLO,
NEW TO THE SITE,41 YR OLD RIDER. Kx PROBLEM IS THIS; I'VE JUST BOUGHT A VERY CLEAN AND SEMI-FRESH 2001 KX500, AFTER ALL THE FLUIDS AND FILTER CHANGES, I PUT FRESH GAS AND OIL IN IT AND WENT FOR OUR FIRST RIDE.
** AFTER ALL RUNS OF ALL SPEEDS, I CLOSE THE THROTTLE AND COAST ALITTLE, BUT THE ENGINE SURGES AND BUCKS THE BIKE FORWARD 3 OR 4 SMALL TIMES, BEFORE IT WILL ACKNOWLEDGE THE SHUT GAS AND THEN IT WILL MELLOW OUT ON IT'S IDLE...
IT DOE'S IT REAL BAD IF I DO A HIGH SPEED RUN AND CHOP THE GAS ,(CLUTCH-OUT) AND COAST, THE BIKE SOUNDS AS IF I BLIPPED THE GAS REAL FAST 3 OR 4 TIMES, BUT I DON'T- IT DOE'S. AND. WHY IS THIS, PLS.??? NONE OF MY PAST BIKES HAVE EVER DONE THIS,, KX'S AND KTM'S...
THANKS, jdv, sorry for caps.

gowen:
Hi, welcome to the site, I will start by saying mine does the same. Just like you describe. I believe it is normal for the big KX due to vaccume. You might want to do a search on jetting, you will see that it is pretty normal and I've done ALOT of research in trying to rid the KX of surges and to get an idle.

neverendingmods:
My new 04 500 does the same thing.  The jetting thread and some others(surging) put my mind at ease.  I thought for awhile my throttle was sticking.  But no, it's just the big cylinder firing. Excess gas and the air vacuum I guess.  Only does it after wide or near wide open blasts.  The only bike I've owned that's done it too.  My only big bore.   :wink:

KXcam22:
jvd500,
  Hope thats a "KX" problem (KY problems are kind of personal-HA HA).  Yeah just as everyone has said that surging is normal.  Mine probably does it worse than most but is not an issue when riding.  Take it a a sign that your jetting is pretty close. Welcome to the site. Cam.

04kx500:
I've had three 500's since i was 17 and i'm 36 now and so far and my 04'kx500 does it to , consistency is a good thing. The first (85)and last(04) make a almost knocking noise that i have learned to ignore, some do and some dont. I tore enginge and split case on " 04" at  4 hours and replaced rings,upper bearing and clips cause i was there and  nothing was found abnormal anywhere.
eric 04kx500

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