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Fork oil level


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sbronco68



Joined: 01 Apr 2007
Posts: 331


2005 Honda CRF450R

PostPosted: Thu Sep 06, 2007 10:42 pm    Post subject: Fork oil level Reply with quote

Hope you guys can help me.
I changed my fork oil the other day for the first time and have a few questions. I pulled the inner cartridge apart and drained the inner oil. I then filled the back up with new oil and pumped the rebound tube tell the extra oil came out the holes in the side. After that I put the forks back together and put 680cc oil in each leg. So now after reading the Honda book they say to only pump the rebound cartridge 3in but i had pumped it all the way. So did I screw it up? Also how do you check fork oil level?

Thanks in advance for any help.
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NCLR1



Joined: 24 Dec 2006
Posts: 474
Location: Menifee, CA

2004 Honda CRF450R

PostPosted: Fri Sep 07, 2007 6:54 am    Post subject: Reply with quote

Your manual does say to push the rod in only a few inches before you put the outer tube back on, then drain the overflow. But, shortly after that it tells you to pump the shock full stroke anyways. So, I don't think you would mess anything up.

How did the oil look?
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sbronco68



Joined: 01 Apr 2007
Posts: 331


2005 Honda CRF450R

PostPosted: Fri Sep 07, 2007 10:39 am    Post subject: Reply with quote

NCLR1 wrote:
How did the oil look?


The oil was pretty bad, I can't see how it gets dirty like that but I guess itís just from the bushings.

I guess I should have read further in the book. So my question now is I think I have slightly different oil levels in my forks or maybe to low since I pumped that extra oil into the garbage not back into the fork leg with the fork together. So how do you use one of the oil level gages? It looks like just a piece of tubing with a syringe.
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NCLR1



Joined: 24 Dec 2006
Posts: 474
Location: Menifee, CA

2004 Honda CRF450R

PostPosted: Fri Sep 07, 2007 11:43 am    Post subject: Reply with quote

Those just measure what is going in, I think. It is used to make sure you are adding a precise amount. I would think that you should be ok. If you are worried, the only real answer would be to drain them again and refill. That would suck though.
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RJacks258



Joined: 11 Aug 2007
Posts: 40



PostPosted: Fri Sep 07, 2007 6:48 pm    Post subject: Reply with quote

Pushing the piston rod in the cartridge and holding it is the proper way. Then let it return by itself. It should go halfway or more. Hopefully all the way.
680cc in the outer leg is WAY too much. I repeat, WAY too much. Working range with stock springs is usually around 350 - 425cc. You better drain before you ride.
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sbronco68



Joined: 01 Apr 2007
Posts: 331


2005 Honda CRF450R

PostPosted: Fri Sep 07, 2007 9:03 pm    Post subject: Reply with quote

RJacks258 wrote:

680cc in the outer leg is WAY too much. I repeat, WAY too much. Working range with stock springs is usually around 350 - 425cc. You better drain before you ride.


Thanks for all your help guys. I just checked the mark on my measuring cup and i put in 380cc not 680cc sorry about that thanks though for the warning.

Here is the tool I was talking about. How do you use it?

http://www.motionpro.com/motorcycle/tools/fork_oil_level_gauge/
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AgentSmith



Joined: 10 Apr 2006
Posts: 14860
Location: In the Matrix...Waiting for an Exit.


PostPosted: Fri Sep 07, 2007 9:13 pm    Post subject: Reply with quote

My 450X is sprung very heavy ( .50kg) and I'm running 345ml of HP 5.
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RJacks258



Joined: 11 Aug 2007
Posts: 40



PostPosted: Sat Sep 08, 2007 6:25 pm    Post subject: Reply with quote

sbronco68 wrote:
RJacks258 wrote:

680cc in the outer leg is WAY too much. I repeat, WAY too much. Working range with stock springs is usually around 350 - 425cc. You better drain before you ride.


Thanks for all your help guys. I just checked the mark on my measuring cup and i put in 380cc not 680cc sorry about that thanks though for the warning.

Here is the tool I was talking about. How do you use it?

http://www.motionpro.com/motorcycle/tools/fork_oil_level_gauge/

The Twin chamber Showas don't use the level tool. You fill the inner cartridage and bleed it off, then the outer chamber gets a measured volume like the 380cc you used.
The level tool is for old style cartridge forks.
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