Idle problem

I'm Tom and I have a problem with the idle on my rather vintage 98 YZ 400. Sometimes it idles too fast (so I reset it) and sometimes it wants to die (so I reset it) After re-adjusting the idle it will be OK until I give it a hard ride and than I'm back to adjusting the idle again and again. Any thoughts on fixes for such a problem. NOTE: I replaced a cracked vacuum release plate a few years ago on the slider. That caused a really high idle all the time.

Thanks in advance,

Tom Nolan

clean out the jets, ESPECIALLY the pilot.

thanks, I'll give that a try

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