Posting a question for a friend

[Thunderbolt]

I have not encountered this, so didn't have an answer for him other than it could be a fork or rim problem.
Here is his question"  My 99 Tourer seems to have a shudder or slight hop in the front suspension when riding.  I don't think I am imagining it because the 98 doesn't do it.  It is most noticeable around 35-45 mph. I thought with the replacement of the front tire it would go away but it is still there.  It is not bad but it seems to be getting slightly worse.  Any ideas as what might cause this?  Could it be a bearing or something in the front forks?"   

Any ideas?

[Dougger]

I have t he same problem, same speed. I thought that it was the Avon Cobra. Avon said to buy a new tire, send in the one on the bike now. If it is bad, if being the operative word, they may reimburse me.
I can find good use for the $200.00

[Red Diamond]

My Tourer has the same up and down hop at these indicated speeds. I have E3's on it and contacted Dunlop about the issue, they told me to take it to a dealer and have them ride the bike, but  I noticed that my I/S has the same hop on the same road and most other roads, so my solution was to ignore this issue as it was not noticeable at high speeds. The I/S has Avon Cobras on it.

[HayHauler]

Is the tire balanced well?  

My 99 IS does the same thing.  To fix it, I just ride it faster!  
Avon Cobra on the front.

It could also be that your front fork springs are getting weak or low on fluid.  This would make the front end a little "spongy"

Hay  
Jimmyt

[hubcapsc]

If the front tire's been replaced, and if it is balanced, it wouldn't hurt to tear the forks apart and put them back together...
with new bushings and stuff anywhere they look worn...



The manual lists all the "wear items", when I did mine I had all the wear items on hand, I replaced the ones that showed wear,
probably should have replaced them all while I was in there...

-Mike

[Thunderbolt]

   

[Valkahuna]

My Valk does it slightly depending on the road, and I've attributed it to that. Almost new E3's frt & rear.

My H-D had this problem badly and it ended up being warped brake rotors on the front. Replaced them both and it's good as new!

I would not suspect suspension or springs, but rather something that is rotating, and developing either inertia or energy. Does it get better with warmer temps or after tires are warmed? Could be flat spots from sitting.

[Tundra]

Terry, I had the same problem when I purchased my Valk. At that time I put a Battle-Axe 200 on the rear and a Avon Venom on the front. The problem went away and I attributed it to old worn tire or balance.
   Then around 11k later I noticed it again, I replaced both tires and rebuilt my forks and added Progressive springs and Progressive shocks in the rear. I also replaced all the wheel bearings (just because) You know I have the bad habit of replacing things that aren't broke.
  I am currently running a GYTT CT on the rear and an Avon Cobra on the front. I haven't experienced the problem since and due to the fact that I did everything at the same time, can't really tell you what it was. So after typing all this mumbo jumbo, I'm really not much help   I know you won't rest until you determine what it is, best of luck.

[gordonv]

I also had the same "bounce" from 30-45 MPH range, and sometimes notice it at 50 MPH.

I bought the bulk dyna beads, put them in the front tire only, and now I seem to have a heavier bounce (not by much) but a tighter range, 35-40 MPH. Was thinking of taking the tire off the rim, and insure there was no run flat or the like in there, causing the beads to clump.

I'm very much interested in knowing how this works out, for any future ride I get.

[Thunderbolt]

he is leaning toward having his front forks rebuilt and having progressives installed.

[R J]

Mine did that a long long time ago when I did not follow the proper procedure of tightening up the front axle, squeeze clamps and etc.

I think the bounce was the thing that corrected it.

Since then I follow the procedure, written in big letters and hung on the garage wall so as to be able to follow it without too much exertion..

[bigdog99]

dont forget the back tire. with the drive shaft the offset from the rear will go clear to the front. when i put my CT on i balanced it myself and what a difference.