Thicker fork oil leaving residue? - Speedzilla Motorcycle Message Forums
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 11-17-2011, 02:56 PM Thread Starter
Senior Member
Join Date: Jan 2010
Posts: 131
Thicker fork oil leaving residue?

Hey all, I just bought a new (to me) 2005 hayabusa last night. The original owner had some kind of suspension work up front because he rode a lot at Deal's Gap. The bike has 20,000 miles and I'm not sure when the work was done but I see residue after riding or pumping the suspension. One guy I called at a local shop said that if they have thicker oil I'll see more residue. Is this the case? What I plan to do is ride to the shop where the work was done and ask the guy face to face but I'd like to hear what you all have to say. Thanks
bigwake is offline  
Sponsored Links
post #2 of 4 (permalink) Old 11-17-2011, 03:09 PM
Senior Member
SifuGR's Avatar
Join Date: Dec 2007
Location: Jax Beach, FLA
Posts: 460
I don't know...

but i'm about to get my forks serviced too... got a leaky seal after 30k miles... never had them done before and i KNOW it shouldn't have been this long before getting them freshened up... If only i could find a set of Ohlins for Cheap, or Freeeeeeeee!
at any rate, i'm interested in what those who know more than i have to say.

SifuGR is offline  
post #3 of 4 (permalink) Old 11-22-2011, 02:36 PM
Senior Member
Newera's Avatar
Join Date: Apr 2010
Posts: 226
Hayabusa forks may be a bit soft as standard...

Thicker oil isn't necessarily going to improve forks as it will increase the damping (Making them feel harder) when in effect it's making them react slower, not absorbing bumps and rebound being later than the forks were designed for.
Best way to improve fork performance is have them professionally re-sprung & re-valved to suit your riding and match the rear shock at the same time, relative ride heights, etc.

Residue is usually from work fork seals, not thicker oil (Which if anything will be harder to get past good seals than thin oil...).

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Newera is offline  
post #4 of 4 (permalink) Old 11-22-2011, 04:23 PM
sburns2421's Avatar
Join Date: Sep 2005
Location: SW MO
Posts: 9,103
If you are talking about residue on the sliding portion of the forks you have a leaky fork seal. Pull off the outer dust cover and wipe the seal. Ride a short time and check the seal, it will likely have a drip of fluid on it.

If the forks have never been serviced at 20k miles they should be dismantled, cleaned, and any worn parts replaced (bushings and seals at a minimum I would guess). Inspect the chrome sliders for any hint of nicks or imperfections that would have nicked the seal to start with. Sometimes these can be polished out very carefully with 2000 grit sandpaper, hand rubbed in 45 degree cross-hatch directions between horizontal and vertical.

This would also give you a chance to change springs and install any type of internal upgrade if you want.

These are not difficult things to work on if you have any special tools that are required for your particluar model. You could buy the special tools for what it would cost to have them done at a shop.

BTW, the used fork oil will likely be black as coal and will stain anything it comes in contact with, so be forewarned.

1985 Honda VF1000R, 1990 Ducati 851, 2008 YZ450F
sburns2421 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Speedzilla Motorcycle Message Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome