Fork Oil - Ducati.ms

krill · May 9th, 2010, 11:43 am

Just drained the oil on my 08 Hyper and there was 700ml in each leg, this is quite a lot more than recommended in some of the threads here, I'm going for a lighter grade so can anyone tell me from experience how much I should put in each leg please? I have read all the threads but nobody seems to agree

08hyper · May 9th, 2010, 2:04 pm

Quote:

Originally Posted by krill

Just drained the oil on my 08 Hyper and there was 700ml in each leg, this is quite a lot more than recommended in some of the threads here, I'm going for a lighter grade so can anyone tell me from experience how much I should put in each leg please? I have read all the threads but nobody seems to agree

In the Ducati service manual is says the oil level is 160mm from the top, oil weight stock is 7.5w. Hope this helps. Aloha Alex

Monstaman · May 9th, 2010, 2:50 pm

Supposed to be 480mls per leg .. accordingly to the book, the Ducati techs did not know any different and said do what the book says.

CAlexio · May 9th, 2010, 3:03 pm

you got yourself a new bike yet andi?

Monstaman · May 9th, 2010, 5:59 pm

Quote:

Originally Posted by alexio

you got yourself a new bike yet andi?

Not quite, ordered a 990 SMR but it has not arrived yet.

freezer16801 · May 9th, 2010, 11:15 pm

I would change the viscocity too while you are at it. 5 weight inproved the very harsh compression valving and still flows through the rebound valve slow enough.

I would measure from the top with the fork compressed and the spring removed rather than by adding an amont of fluid. Others have set their cartridge upside down all night to remove all of the fluid. There always seems to be some remaining inside. And from my experience, tuning the air gap is pretty important to enable you to achieve the right amount of fork travel. I think I set my air gap at 110mm. I am thinking of changing that to around 120 mm as soon as I get the chance to take the forks off again.

krill · May 10th, 2010, 1:08 am

Quote:

Originally Posted by freezer16801

I would change the viscocity too while you are at it. 5 weight inproved the very harsh compression valving and still flows through the rebound valve slow enough.

I would measure from the top with the fork compressed and the spring removed rather than by adding an amont of fluid. Others have set their cartridge upside down all night to remove all of the fluid. There always seems to be some remaining inside. And from my experience, tuning the air gap is pretty important to enable you to achieve the right amount of fork travel. I think I set my air gap at 110mm. I am thinking of changing that to around 120 mm as soon as I get the chance to take the forks off again.

Thanks for the advice, how do you tune the air gap ??

freezer16801 · May 10th, 2010, 1:56 am

Quote:

Originally Posted by krill

Thanks for the advice, how do you tune the air gap ??

I am sure others will chime in andn be more precise; but my understanding is that the space of air left inside the fork can compress and act as a supplemental spring. So if you have 120 mm of air gap, it will have more air to compress than 100 mm. Therefore, if you have too little air gap, you will lose travel and your fork could feel stiff. This is one of the reasons why many stock hypers were only using 1/2 to 1/3 of the designed travel.

You can tune this by starting with a baseline that has worked for others like the amount that I gave you of 110mm. If you find that you are bottoming out or not reaching all of your travel you increase or decrease the amount of air gap accordingly.