Maintenance & Technical > KX500 Original

Head-shake at High speed

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don46:
out of balance suspension will cause this, back to stiff front to soft, changes the rake and can cause head shake. The K5 doesn't typically head shake if set up properly, are you forks pulled up in the clamps? they turn better but then you can get head shake. The CR 500 is pretty bad due to the steering head rake. I would take big belly bobs advice and set the rear sag, more than likely thats the culprit.

another trick that was used for high speed riding was to tighten the steering stem nuts a bit tighter to cause a modest amount of drag, that helped, and of course you can always get a steering damper.

Hillclimb#42:

--- Quote from: bigbellybob on October 15, 2008, 05:18:37 AM ---
--- End quote ---
this is not a problem on my bike one leg dose compression only and the other leg dose rebound only.
[/quote]
  I had no idea you could do that. Is there other benefits other than not worrying about what I had mentioned about problems with an imbalance?

BDI:
Head shake is usually caused by improperly set rear sag, coupled with loose head bearings. Get the head torqued right and set the sag correctly and I would be very surprised to see it head shake. When ever I go test suspension that is the first two things I do. With the suspension settings way off and out of balance.  I have had bikes do all kinds of scary crap but not head shake.

don46:
you can't do what big belly bob describes unless you change to WP forks, KYB has both comp and rebound. I wouldn't worry to much about not getting the forks equal, as long as you know what the oil level was before leakage you'd be good to go. On the other hand usually when one starts to leak, then the other will shortly.

kiwikx500:
Plenty of things to try  :-) cheers

Probably as usual last thing I've done  :-)

For the first time in years I "burbed" the front folks by removing the two brass screws up top to let any air that may have built up, don't think that is the problem but thought would mention.

Never felt this head shake before, probably doing 70 - 80 MPH. I'll whip the front wheel off and re-install make sure lined up and brake a ok.

If problem not fixed was thinking of going to Firestone and have wheel balanced - is it a done thing ?

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