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Buell Motorcycle Forum » Old School Buell » Archives OSB 001 » Archive through July 23, 2006 » Adjusting compression and rebound? « Previous Next »

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Freeflyer
Posted on Friday, July 14, 2006 - 05:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hey guys finally got around to setting my preload, the rear had to come up a bit the front was fine, Im about 185#s. Im not sure if I should stiffin it up a bit or not. on really crappy roads Im taking a little bit of a beating, but I dont want to soften it up and have it get squirrely in a corner, so Im wondering if the compression was firmed up would it be better or worse, most of the bad bumps are actually the dips were theres a crack and the road slopes down to the crack on both sides.
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Freeflyer
Posted on Tuesday, July 18, 2006 - 06:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

bump. bump.
Anybody have any explanations on how this works?

(Message edited by freeflyer on July 18, 2006)
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Djkaplan
Posted on Wednesday, July 19, 2006 - 07:43 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

When you said you adjusted the preload, did you measure sag front and rear? Are your damping adjusters baselined to the factory specs? I'm 185lbs with gear, and I had to max out the front preload to get proper sag. I added a half turn of compression from the baseline setting and this seems to be fine for the street.

If you are taking a beating, bumping up the compression damping is just going to make it worse. I'm assuming most of the beating is coming from the rear. Try backing off a half turn of compression and adding rebound. You'll know you got it totally wrong if your bike feels like it's "hobby-horsing" over rolling bumps.

Set your sag, baseline the damping adjusters and go from there. Don't have the service manual in front of me, but all this information is posted in the KV.
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Freeflyer
Posted on Wednesday, July 19, 2006 - 05:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

the front was fine the rear preload had to come up a bit, the compression and rebound I checked and they were set to factory original settings I think adding rebound may help keep the tire on the ground so it can roll up the bump instead of smacking into it which is how it feels. But having no prior experience I wanted a second opinion as I dont really know how this stuff works, thank you
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Djkaplan
Posted on Thursday, July 20, 2006 - 08:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If you are getting kidney jarring impacts from bumps, you'll want to back off on the compression damping.
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Silas_clone
Posted on Saturday, July 22, 2006 - 07:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

OK< I have a '99 M2 with a rear shock with a remote reservoir that is clamped to the oil pump. The local HD checked to make sure it was an updated unit, I'm guessing it is the best possible factory setup.

With me [300 pounder] sitting on the bike [bounced it and feet are up] the shock is about 15 inches long, way under the length the manual suggests.

two questions

1. the manual obviously is written for a different shock, so what should my loaded length be? How about dampening/rebound settings?

2. when you add preload, does the shock lengthen? I thought it would shorten.
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Bookyoh
Posted on Saturday, July 22, 2006 - 10:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Silas:

For the recall shock with the remote reservoir, the recommended settings given in the May/June 2001 Fuel magazine are:

Preload with rider seated:
M2L 15.6 - 15.9 inches
All other models 15.2 - 15.5 inches

Compression damping:
M2L full minus 2.5 turns
M2 full minus 2.25 turns

Rebound damping:
M2L full minus 1 turn
M2 full minus 1.5 turns

Mark
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Silas_clone
Posted on Sunday, July 23, 2006 - 06:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Mark, thank you.
I'm guessing that I don't have the L

Where are the compression and rebound damper screws located?
Rather, which is which?

Also, am I correct to assume the shock "shortens" with more preload?
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Silas_clone
Posted on Sunday, July 23, 2006 - 04:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Mark, I'm all set...I figured it out.
KV and the manual to the rescue!!!!

Going for a test, BOY AM I FAT!!!

JUST DID 50 MILES AND YUP, IT DOES FEEL LIKE A DIFFERENT BIKE.
Really had to crank those adjustments to "chubby" settings.

(Message edited by silas_clone on July 23, 2006)
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