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Buell Forum » 1125R Superbike Board » Archives 001 » Archive through March 16, 2010 » Light twitching on the handlebars « Previous Next »

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Redbuell1203
Posted on Saturday, March 13, 2010 - 10:23 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

ok have set the suspension to the corrected settings for a june 08 model and i like the feel, but the front end has a little wobble in the front end at highway speed and I would like to correct this if possible. What would I turn to help me correct this my settings are front preload is 5, comp is 2.5, rebound is 2 the back is at 2 for preload, 20 for comp, and 3.25 for rebound. At full gear I am about 150 lbs. any help would be great since I am really new to this. Austin
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Dannybuell
Posted on Saturday, March 13, 2010 - 01:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

does the front end vibrate over every irregularity? Less front compression.

does the front end feel like it is dancing over every irregularity? Less preload.

front light at speed?
stiffen rear to keep the front from rising.

let me know if this helps
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Redbuell1203
Posted on Saturday, March 13, 2010 - 09:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

you can actually see the handlebars move from side to side ever so little. It is almost like a beginning of a tank slap. I don't have a tight grip(learned that lesson). So I think I will try the less front compression so does that mean go to 2 compression or go to 3 since I am at 2.5? Remember I am new to setting a suspension.
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Dannybuell
Posted on Saturday, March 13, 2010 - 10:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It is very important to do one thing at a time here.

the front may be coming up with wind resistance compressing the rear spring.
I believe that is why the higher the speed you travel at the more preload/spring you need. increase rear preload with tool from under seat tool kit. try it at least two settings stiffer to make sure you notice what is happening. if that isn't it put rear preload back to original.

Front forks can have too much compression or preload or both and give too much road feedback.

Compression: go to the lower legs and with a screwdriver unscrew 1/8 or 1/4 turn at a time. try it at least twice with two settings out to make sure you notice it is softening. if that isn't it put compression back to original. With a socket at the top of the fork unscrew anodized nut 1/8 or 1/4 turn at a time. this will reduce preload. try it at least twice with two settings out to make sure you notice that it is softening. if that isn't it put front preload back to original setting.

My S1 had tank slappers' for two reasons it needed a fork brace, and at higher speeds the rear Penske shock with a spring and valving for my big a**. The front gets real twitchy when it isn't firmly planted. The stiffer rear spring keeps front to rear weight transfer from engine torque and or wind resistance to a minimum.

hope this helps.
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