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Thread: Fork oil change

  1. #71
    Senior Member
    Bike: NC700x, ST1300, XR250L, CX500 Turbo, TRX350fwd, CT90, C70, TRX250, TRX 500
    Join Date
    Dec 2012
    Location
    Wausau WI
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    The front fork bushings ( top and bottom) are the wear points and they tend to contaminate the oil as they wear.
    Generic picture of the bushing wear:

    Fork oil change-image-jpg

    The rear shock is not exposed to the bushing wear as it is not supporting the bikes weight at an angle like the front. The rear shock oil and air seals and shock rod are wear points from water, grit, rust and will leak over time.
    Last edited by showkey; 11th October 2016 at 21:22.

  2. #72
    Senior Member Fork oil change
    Bike: 2013 NC700S
    Join Date
    Jun 2015
    Location
    Surrey, BC (Canada)
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    565
    Much to my disappointment the right side fork seems to be leaking oil now around the seal. Any suggestions?

    I noticed it when I was riding home from work. Front brake was spongey. Sure didn't feel comfortable with a spongey front brake. Seems like some of the oil got on the disc. Have taken the caliper off and and cleaned everything up with brake cleaner. Will put it back together now for a test tomorrow

  3. #73
    Senior Member Fork oil change dduelin's Avatar
    Bike: NC700XD, ST1300, Elite 80
    Join Date
    Jul 2012
    Location
    North FL USA
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    3,306
    Fork oil change today at 20,000 miles on the 2015. The fork has Cogent Drop in Cartridges that I originally set up with Golden Spectro 85/150 5wt oil set to 140 mm. Today I used Showa Honda SS-7 5wt which has almost identical properties.

    150 mm is right at 16 oz per leg which is right handy as SS-7 comes in 16 oz bottles.
    Last edited by dduelin; 29th April 2017 at 19:26.
    Dave

    ST1300
    NC700XD
    CH80



  4. #74
    Senior Member
    Bike: nC700X
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    Sep 2016
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    gulf coast
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    My 2012 with 8.5k has tiny cracks in the dust cover. , but no leaking. Is this normal and is it a prelude to leaking? Is it a good idea to replace the seals and dust cover when changing the oil since you have it apart already? Oh, and thanks for the write up. I found this when searching for fork seals.
    How to Replace Fork Seals: 8 Steps (with Pictures) - wikiHow
    2012 Honda NC700X | Doin' Time | Motorcyclist
    Last edited by eastbayandy; 24th August 2017 at 08:50.

  5. #75
    Senior Member Fork oil change
    Bike: 2012 NC700x
    Join Date
    Jun 2013
    Location
    California, USA
    Posts
    661
    Quote Originally Posted by eastbayandy View Post
    My 2012 with 8.5k has tiny cracks in the dust cover. , but no leaking. Is this normal and is it a prelude to leaking? Is it a good idea to replace the seals and dust cover when changing the oil since you have it apart already? Oh, and thanks for the write up. I found this when searching for fork seals.
    How to Replace Fork Seals: 8 Steps (with Pictures) - wikiHow
    2012 Honda NC700X | Doin' Time | Motorcyclist
    Your dust cover won't necessarily be a prelude to your fork seal leaking. The dust cover just helps remove gunk from the fork leg before it gets into the seal and gives it a chance to cause it to leak. Just keep riding it, if it starts to leak run a small piece of thin plastic up and around the fork leg into the fork seal to dislodge any material that might be holding the seal open -- if that doesn't work, that means your seal is done and it's time to replace. At that point, I'd replace the seal and the dust cover as well.

    But, to answer your question, the condition of the dust cover does not really mean anything in relation to the condition of your fork seal. In terms of replacing them when you do the oil since you have it apart? You can, some would, but I am a firm believer in the ol "if it aint broke, don't fix it" rule. I've got 40k on my stock seals and they're still fine, and the fork legs are always coated in year-round gunk from every day commuting. When they leak, I'll replace them.

  6. #76
    Junior Member
    Bike: 2012 NC700X
    Join Date
    Jun 2017
    Location
    Leesburg Florida USA
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    19
    Great write up with very good pictures. Many thanks...I recently purchase a 2012 NC700X and will probably need to change the fork oil soon. This write up will be very helpful. Thanks again...

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