Originally Posted by
rmdhawaii
When it doesn't return right away, it means something is too lean and you have to richen it up. You may have to play with the needles a bit to find the right balance between the idle & LSN.
At 197F, try leaning your HSN 1 hour at a time. Put in on the track, run it for a few laps, bring it in and check your temp and idle.
or he has an airleak
........the crf though acts lean when it is rich, just lean top and bottom dude, then see if it still does it, if not it's fien, ten re tune top at the track.