Maintenance & Technical > KX500 Original

Head-shake at High speed

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kiwikx500:
Running 14 lb on both Tires, felt lot of vibration through hand grips at high speed in a straight line (flat shingle road) and their was head-shake - could feel like the front wheel tracking left to right.

Had the tyre swapped around on the rim to get more life out of it and hub respoked.

Can the brake dragging cause this ? Pretty sure bearing looked and went back in ok.

Any pointers please to steer me in the right direction ?

Cheerz

Kiwi

KXcam22:
Try experimenting with your front fork clickers.  Sometime too much compression can make the front end nervous. Cam.

bigbellybob:
I'm not saying this is the problem but setting the sag makes a big difference.


--- Quote ---Can the brake dragging cause this
--- End quote ---
most definitely if the front brake is dragging. i had this happen the front master was holding pressure after releasing the brake. i dumped it 3 times before realizing the front brake was dragging. the front end was all over the place and it was scary. if the brake is dragging fix that first.

Hillclimb#42:
 I wonder about off set fork set up. That is, in my own personal experience, I get nervous about fixing one fork seal and not the other. Then the sides would have different compression and rebound than the other side. Then I wonder how to be sure they are the same right now. Tighten the adjustment all the way and count the turns to make them the same turns back out?
  Then also have to mention not one of my bikes and my teammate's bikes,8 in all, have a perfectly balanced wheel. We wash them on a stand and use the pressure washer to spin and clean the wheel and that gets the whole bike moving on the stand. The guy I have mount tires for me has another guy lacing and truing wheels all the time. Front wheels do get all wobbily easy. I never seem to notice because of bumpy riding conditions. But I imagine flat out on whatever a shingle road is, would be shakin'.
  Could be the tire. how fast are you riding 50?60?

bigbellybob:

--- Quote ---Then the sides would have different compression and rebound than the other side.
--- End quote ---
this is not a problem on my bike one leg dose compression only and the other leg dose rebound only.
if the front brake is dragging that's a problem. the front end will be all over the place its a very weird feeling. its not like normal head shake or speed wobbles, the front end tracks funny and almost seems like the rear end is trying to pass the front end.

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