Maintenance & Technical > KX500 Original

Idle Kick-Backs v.II

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kawdude:
Can someone describe how to tell if the bike is running rich or lean?  I know this is lame question but I can't tell by the sound.

fast500#12:
when it is running rich it will smoke more than usuall and some times depending how rich it will hesitate when you goose the throttle. when it's lean you will have higher than normal operating temps and some times get what i like to call run away idle, when your bike is idling really high and doesn't like to shut down with the kill switch. this is intensified by the higher engine temp. also when its rich you get the squirt gun effect if its really rich, lots of black oily spatter out of the scilencer. there are other ways of telling these are just the ones that i know and love.

kawdude:
Let me throw out what it sounds like...
When I first reassembled bike ran rough up to mid and wouldn't idle.  From mid on ran smooth...smooth whine with lots of snap.  Next time I rode the smooth even whine at mid and beyond is gone.  Rough sound.  I don't know how to describe it.  Doesn't sound pingy but I don't really no what that would sound like.  Power is still there but not snappy.  I can't say it bogs either.  I don't notice splooge anywhere.

mikesmith:
If its rich it will "blubber" is how I like to describe it,it wont sound crisp or have much pull/acceleration or cut out down low.The plug will be black,wet or foul and as mentioned above wet exahust.If its lean the idle or even holding a low throttle the engine will idle up and down on its own, the bike will ping and run hot.Jetting is something you need to work on to see what works and what doesnt,take notes.Weather temp,humidity,altitude,fuel and mods done to the bike effect jetting,so if you write it down for what works on what type of conditions it makes future jetting easier.Your owners manual has this information in it that would help make it easier,or let us know how it goes.

kawdude:
Thanks guys.  I would say the bike is rich because is the lean descriptors you mention aren't happening.  I'll look at the plug.  The bike doesn't load up or cut out down low and doesn't appear to be splooging.  Currently jetted at 168m, 58p, and the clip is on the 3 position.  Would it safe to raise the clip to lean it?

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