Page 1 of 2 12 LastLast
Results 1 to 10 of 15

Thread: Maintenance Cap O-Ring

  1. #1
    Junior Member
    Bike: '12 NC700X
    Join Date
    Oct 2018
    Location
    USA
    Posts
    12

    Maintenance Cap O-Ring

    Im preparing for a valve check and noticed in the manual that the o-rings for both the maintenance cap and the window bolt to check for TDC (I dont recall the actual name) are supposed to be replaced after removal and not reused. Problem is, i cant find these online anywhere.

    Anyone know where to pick these up?

  2. #2
    Senior Member Maintenance Cap O-Ring dduelin's Avatar
    Bike: NC700XD, ST1300, Elite 80
    Join Date
    Jul 2012
    Location
    North FL USA
    Posts
    3,974
    Part numbers 91303-377-000 & 91344-PC9-004

    2015 Honda NC700XD AC ALTERNATOR COVER | CyclePartsNation
    Dave

    GL1800
    NC700XD




  3. #3
    Senior Member Maintenance Cap O-Ring
    Maintenance Cap O-Ring
    DirtFlier's Avatar
    Bike: 2013 NC700x/w DCT
    Join Date
    Dec 2014
    Location
    Troy, Ohio
    Posts
    909
    I've never replaced either of those on my last 3-4 Honda motorcycles. There is hardly any oil in that cover so why worry about a leak?

  4. #4
    Senior Member Maintenance Cap O-Ring dduelin's Avatar
    Bike: NC700XD, ST1300, Elite 80
    Join Date
    Jul 2012
    Location
    North FL USA
    Posts
    3,974
    There are threads about having to chisel the cap off however.
    Dave

    GL1800
    NC700XD




  5. #5
    Super Moderator Maintenance Cap O-Ring 670cc's Avatar
    Bike: NC700X, GL1800, KLX140G, CRF250L Rally, Ruckus 50
    Join Date
    Aug 2012
    Location
    USA
    Posts
    7,075
    Although it goes against the specific steps of the valve adjustment procedure, I have stopped removing the cap for viewing the cam position on the right side of the engine. It is so easy to tell which TDC you are on by the looseness of the appropriate rocker arms. I suppose if it’s your first time or two, checking the cam visually might be a good idea, but after some experience, it’s really a waste of time. The only cap you’d need to remove is the one at the crankshaft, left side (while seated).
    Last edited by 670cc; 3rd October 2019 at 18:57. Reason: Spelling
    Greg
    GWRRA Member
    AMA Life Member
    "Quarter Million Mile Club"

    NanCyX . . . . . . . . . . The 250

  6. #6
    Junior Member
    Bike: '12 NC700X
    Join Date
    Oct 2018
    Location
    USA
    Posts
    12
    Quote Originally Posted by dduelin View Post
    Part numbers 91303-377-000 & 91344-PC9-004

    2015 Honda NC700XD AC ALTERNATOR COVER | CyclePartsNation
    Thanks much!

    670cc - Good to know. This is my first attempt, and I think it may be the bike's first as well. I've no idea if the previous owner ever did it. Glad its a simple process though.

  7. #7
    Senior Member Maintenance Cap O-Ring dduelin's Avatar
    Bike: NC700XD, ST1300, Elite 80
    Join Date
    Jul 2012
    Location
    North FL USA
    Posts
    3,974
    I don't replace the O-rings every time myself but I think it is important to do it maybe every other time. The caps are torqued to relatively low torque values and what happens is the O-ring gradually deforms under heat and pressure. The cap is removed then replaced and instead of a compliant O-ring initially compressing and giving some 'feel' to the correct torque, the cap comes up metal-to-metal with little feel and we easily overtighten it past the 7 or 11 ft/lb setting, setting up a difficult removal next time. The O-ring should be oiled and the cap threads greased as well.
    Dave

    GL1800
    NC700XD




  8. #8
    Senior Member Maintenance Cap O-Ring
    Bike: 2013 NC700S
    Join Date
    Jun 2015
    Location
    Surrey, BC (Canada)
    Posts
    1,037
    I have done this three times now. I would inspect the rings looking for damage and replace them if they looked damaged or started leaking.

  9. #9
    Senior Member Maintenance Cap O-Ring
    Maintenance Cap O-Ring
    DirtFlier's Avatar
    Bike: 2013 NC700x/w DCT
    Join Date
    Dec 2014
    Location
    Troy, Ohio
    Posts
    909
    Using the small viewing port on top is often difficult for first-timers because the marks "TF" or "TR" can go by quickly, almost without you seeing them! And don't forget to remove the spark plugs because if they are still installed, it's almost impossible to get the piston to stop at TDC!

  10. #10
    Junior Member
    Bike: '12 NC700X
    Join Date
    Oct 2018
    Location
    USA
    Posts
    12
    Good to know, Thanks!

Similar Threads

  1. To Ring or not to Ring (O/X ring chains)
    By Sandspike in forum NC700 General Discussion
    Replies: 14
    Last Post: 10th March 2018, 04:44
  2. How to remove Blind snap ring?
    By Garazins in forum NC700 Technical
    Replies: 12
    Last Post: 26th May 2016, 04:36
  3. O-Ring Throttle Lock
    By ST13Fred in forum NC700 Mods
    Replies: 19
    Last Post: 1st April 2016, 14:21
  4. What Size Ring Terminals for the NC700X battery?
    By belrix in forum NC700 Mods
    Replies: 3
    Last Post: 25th March 2015, 16:00
  5. new x- ring chain
    By itlives in forum NC700 Technical
    Replies: 20
    Last Post: 26th November 2014, 12:40

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •