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They talk about "head shake" and "fall away". So I did some looking and figured out what the decel head shake was, but I cannot figure out what fall away is? Can someone please explain what it is, and how it affect the handling of our bikes?
Both, excellant answers. Although KCFLHRC your answer is probably a little closer to what I was looking for Thanks for taking the time to post the YouTube link.
Nice video for adjusting it.........but what is it?
Just curious.
It's a way of measuring the tightness of the steering head bearings. You measure the distance where it begins to "fall away". So in the video he measured it in both directions where it began to fall away and added those 2 numbers together. There will be a spec in the Service Manual for this and you either loosen or tighten the nut to get it within spec. When it's too loose it can cause wobble in the front end and other handling issues.
thats all fine and good, but this is not correct for a roadglide. the triple trees on the touring bikes are 'backwards' so you can not do this test on the. on the touring bikes, the test is much easier actually. make sure the front and back are the same height off the ground, then turn your handlebars all the way to the steering stop. then let go, and count the number of swings, or partial swings, until the front end stops. the current spec on a roadglide is 1-2 swings. it is higher on the batwing bikes.
basically, this is just a quick gauge for measuring the amount of preload on the steering head bearing. if the bearing is too tight, you'll get jerky handling. if its too loose, then you'll get the wobble.
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