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which fork oil?

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donniemateno
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Joined: 01 May 2011
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PostPosted: 08:07 - 26 Oct 2012    Post subject: which fork oil? Reply with quote
Im getting my fork seals changed as they have started leaking on my s reg cb500

Wondering if anyone knew which oil i might need as seems a big selection
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Current bike: Honda CBR 600 F3
Previous bikes: Honda XR 125L5 , BMW 800 ST, Honda CB500
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hmmmnz
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Joined: 22 Aug 2006
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PostPosted: 08:16 - 26 Oct 2012    Post subject: Reply with quote
how heavy are you?? recommended is 7.5 or 10w, but if you are over 70 kg then its too thin, i generally use a 15 or 20w oil,
use 15 if you are under 100kg 20w if over
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donniemateno
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PostPosted: 08:18 - 26 Oct 2012    Post subject: Reply with quote
Im 85kg

didnt relise oil basd on weight
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 09:35 - 26 Oct 2012    Post subject: Reply with quote
I use Automatic Transmission Fluid in the forks.

There is a fair chance Honda do too. It's often specified in the workshop manual.
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map
Mr Calendar



Joined: 14 Jun 2004
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PostPosted: 09:44 - 26 Oct 2012    Post subject: Reply with quote
stinkwheel wrote:
I use Automatic Transmission Fluid in the forks.

There is a fair chance Honda do too. It's often specified in the workshop manual.

That may be the case as the Honda packaged one for mine does not specify a W rating.

Interested in this as I need to get some soon anyhow to fix a leaking seal. It's a job I'm not looking forward to doing.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 09:48 - 26 Oct 2012    Post subject: Reply with quote
map wrote:

That may be the case as the Honda packaged one for mine does not specify a W rating.

Interested in this as I need to get some soon anyhow to fix a leaking seal. It's a job I'm not looking forward to doing.


It's piss-easy once you have the bottom bolt out. I have had to drill them in the past though (even though I have an impact wrench) so it might be worth ordering a couple in just in case.

They are very easy to drill if you need to. Socket head = self-centering.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 17:46 - 26 Oct 2012    Post subject: Reply with quote
donniemateno wrote:

didnt relise oil basd on weight


It isn't really

Fork oil weight controls how quickly the forks compress, but does stuff all for how far they compress.. However thicker fork oil is a quick bodge to make the forks feel stiffer.

To cope with more weight either use a touch more oil in the forks (means less air, and the air acts as a spring), stiffer springs or if just a bit use some coins on top of the springs to preload them a bit.

All the best

Keith
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