Maintenance & Technical > KX250 / KX125

Adding or changing Fork oil?

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hughes:

--- Quote from: Arigato on July 25, 2006, 02:39:41 AM ---What is a synigen? :mrgreen:

--- End quote ---

My spelling sucks. I corrected it I think.  :-D

Arigato:
I knew what you meant, I was just giving you a hard time. :-D 

KXcam22:
If you do them with the forks in the trees, the main thing is to have the tubes almost vertical which you can do by tipping the bike forward on a stand until the forks are fully compressed.  A tie down can be used to keep them compressed while you add oil.  If the oil has been in awhile it is best to take the forks out (as hughes says).  That way you can pump the old oil out easier along with any gray deposits.  Not sure what others do, but I always flush my forks with some varsol to get as much of the aluminum deposits out. The deposits settle in the bottom of the fork which clogs up the base valve (compresion) and the clicker adjuster. Hope this helps. Cam.

Eric Meyer:
Thanks for all the good info. When measuring the Oil level, are you measuring the oil volume or the level in the fork? Also which weight oil should I get? Manual calls for 5wt I think.

KXcam22:
Eric,
  With newer bikes that have inverted forks you are measuring the actual oil level, that is the measurement of how far the top of the oil surface is from the top of the fork tube (with the forks fully compressed).  I messed up on my earlier reply in that to change oil you must remove the forks to empty the oil. The 5wt is correct. Make sure it is for cartridge forks - which most is now days. Kayaba 01 should be the right stuff but any brand name (maxima, Belray etc.) equivalent will be fine.  Unfortunately most bottles are 1000cc which is not quite enough to do both forks.  For example, my 500 takes about 580cc per leg so I am 160cc short on a change with one bottle. Sometime I reuse 160cc from the cleanest part of the old oil (after you let any contaminants settle out) so I can make do with one bottle and not have most of the 2nd bottle sitting around. Hope this helps. Cam.

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