Maintenance & Technical > KX500 Original

86 kx500, blip throttle takes 5-10 secs to smooth out?? Help!!

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sharpy:
Also when riding, pull in the clutch it revs some before smoothing out, again about 5-10 secs

KX500freak:
i would check for airleaks
if any air comes through unregulated it causes jumpin RPM.

maybe cracks in the rubbersection btween carb and reeds
maybe check with starterspray ,engine running,then apply some on the suspicious zones..

if there,s a leak ,the spray will cause the engine to rev up a bit ,just a bit ,
then you know what to replace

sharpy:
Thanks for the response. I did that first thing and no change. This bike has come a long way in a short time. I just have this left and I'm smokin...

sharpy:
I need mo info!

KXcam22:
Need mo better description!  You have described clutch pulling in and throttle blipping both of which suggest different causes.  For throttle blipping, what you are describing sounds like normal "surging".  It is phenomina common to a K5 that is jetted correctly.  What happens is that after you rev the engine it fires a few extra times and takes a few seconds before the idle returns to normal.  This is normal and you just have to get used to it.  The only way to get rid of it (that I know of) is to return to the over-rich stock jetting.  If the engine revs up when you pull in the clutch then it sounds like your pilot jet is too lean, causing a small bit of lean run-a-way. You may notice that it is worse on cold days. The bike load keeps the engine speed normal and then pulling in the clutch releases the load holding the engine speed and it revs up.  Hope this helps. Cam.

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