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  #1  
Old 03-06-2008, 12:16 AM
pjg351's Avatar
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Default fork oil measuring?

     

How accurate do you have to be measuring out fork oil? I use a jug that goes up in 50 mil increments. So when i need to put in say 380mil iam really only guessing where the 80 mark is, i may be out 5 to 10 mil. Should i be more precise, and what do you use to measure out
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Old 03-07-2008, 04:33 AM
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Default Re: fork oil measuring?

Quote:
Originally Posted by tirebiter View Post
Fork oil level is very important, the oil level directly affects how your forks perform.
The proper way to measure fork oil is take the springs out, collapse the forks all the way down, then measure how far the oil is down from the top of the fork.
If you don't have a manual, check with your dealer for the correct level down.

I run my fork oil 130mm down from the top. After dumping & pumping all the old oil out, I fill the collapsed fork to the top with oil and start pumping the fork up & down for a few minutes till all the girgling noise stops. I then re-fill the collapsed fork up to the top and pump it some more.
After all the pumpin's done, I refill the collapsed fork, take an old spray bottle pump, measure down the straw from the screw cap & snip it off at 130mm (My desired level). Then stick it into the collapsed fork, resting the cap on the fork and pump the excess oil back into the bottle.

Bingo, 130mm down.

The only problem is my wife can't figure out why all her spray bottles stop working with stuff still in them..
This is a great idea/way of getting the level correct if your forks are by volume and not by amount (380cc vs 100mm or something like that). I've been asked that before and never had a great answer.

Now pjg, I don't know how important it is, but to me, I want both forks working equally hard for me, so less in one and more in the other makes one work harder than the other, especially in bottoming resistance.

So in short, I try and get them as close to the same as possible. I attempt +-5cc.
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Old 03-07-2008, 07:51 AM
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Default Re: fork oil measuring?

If you're asking what kind of container to use to measure the oil volume before I pour it in the answer is.........a baby bottle.
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Old 03-07-2008, 03:19 PM
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Default Re: fork oil measuring?

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Originally Posted by Budlite View Post
If you're asking what kind of container to use to measure the oil volume before I pour it in the answer is.........a baby bottle.
Arrh yes the ole baby bottle! Thank you Sir, i hope the wife doesn't get any idea's if she sees me buying a baby bottle!
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Old 03-07-2008, 09:56 PM
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Default Re: fork oil measuring?

Thanks TB i will keep that in mind The baby bottle should be more accurate for the measuring though, better than the jug iam using.
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Old 03-08-2008, 12:43 AM
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Default Re: fork oil measuring?

Quote:
Originally Posted by tirebiter View Post
Woody,
Putting the correct amount in is OK if you've completely torn down your forks, but just draining them and assuming their empty then dumping the proscribed amout in is hit or miss at best.
I ain't arguing with ya, just trying to shed some light...
I didn't take it as argumentative at all.

You make a great point that I had not considered, so I'll certainly use this going forward.

So how do I know what height I want when adding 380cc's worth of oil?

I guess the key is to just make them the same height whatever that ends up being.
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Old 03-08-2008, 04:50 AM
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Default Re: fork oil measuring?

My CRF I had didn't mention anything about oil height. Only to add between 350 - 415cc (something like that) of oil.

I do have the factory service manual and have read it a ton of times.

When I'm home (traveling for work) I'll have to take a look and see.
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Old 03-08-2008, 06:23 AM
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Default Re: fork oil measuring?

Quote:
Originally Posted by tirebiter View Post
.......take an old spray bottle pump, measure down the straw from the screw cap & snip it off at 130mm (My desired level). Then stick it into the collapsed fork, resting the cap on the fork and pump the excess oil back into the bottle.

Bingo, 130mm down.
Man, what a simple idea/solution. Thanks for the tip!
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Old 03-08-2008, 09:20 AM
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Default Re: fork oil measuring?

I use the volume method, spring removed. forks collapsed & fill to so many inches/Millimeter from the top.

But I use one of these tool's

Rocky Mountain ATV/MC

It make it a snap!
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Old 03-08-2008, 02:54 PM
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Default Re: fork oil measuring?

There was one other thing i forgot to ask, can you clean the internals with anything that won't affect the seals etc. Or is it best just to drain the oil and refill?
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Old 03-12-2008, 01:02 PM
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Default Re: fork oil measuring?

Are You tearing the forks comepletely down?
If so mineral spirits will clean excellent , Just
did mine yesterday!
Not for sure how much would be trapped inside if
not tearing down?
OSF
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Old 03-12-2008, 03:13 PM
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Default Re: fork oil measuring?

Quote:
Originally Posted by OlSchoolFool393 View Post
Are You tearing the forks comepletely down?
If so mineral spirits will clean excellent , Just
did mine yesterday!
Not for sure how much would be trapped inside if
not tearing down?
OSF
Thank you Sir! much appreciated
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  #13  
Old 03-23-2008, 07:55 PM
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Default Re: fork oil measuring?

a good graduated cylinder is worth its weight in gold
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