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78' xs650 possible damage...

Discussion in 'The Garage' started by t_t_bui, Jul 21, 2021.

  1. t_t_bui

    t_t_bui XS650 New Member

    Hey guys new to the bike, forum, and everything.

    My friend, who has experience working with engine but not bikes or yamaha, told me to reach out to the community. I have a 78 xs650 that upon draining the oil and removing the plate covers has a lot of metal shavings in it.

    I took the cylinder head off and see the camshaft.

    Was wondering of I need to replace this and is there other issues I need to investigate / replace?


    Attached Files:

    Mikey likes this.
  2. gggGary

    gggGary When a whole one is just too much. XS650.com Supporter Top Contributor

    Had the rubber come off the front guide? I might buff that cam, see if the marks are just aluminum smudges from aluminum cam guide scrapings or if it's wear.
    So my answer (guess) is it depends.
    Mikey and Jan_P like this.
  3. azman857

    azman857 '80 XS 650SG Rider XS650.com Supporter Top Contributor

    What do the rockers look like?
    Mikey and gggGary like this.
  4. Raymond

    Raymond XS650 rider & fettler XS650.com Supporter Top Contributor

    It might be a good idea to get yourself a manual - there are free ones on-line, or buy a hard copy which will pay for itself many times over.
    gggGary and Mikey like this.
  5. Jan_P

    Jan_P XS650 Junkie Top Contributor

    I would test the shavings with a magnet
    Did you drive the machine before ? for how long any signals ?
    As Gary says it is Difficult to tell But after finding the fault
    One needs more info but My first guess would be a replacement cam is needed
    Once you are in there .might as well rise the bar so to speak do a job so it last a while
    Do a bit more since it is such a big job even to lift engine out and in
    Valve inspection .Seats .new CAM Bearings and so
  6. RustiePyles

    RustiePyles Semper Fortis XS650.com Supporter Top Contributor

    Like @gggGary said give them a light buffing, form the pictures it looks like pretty normal wear. I would think that cam is fine. But your front cam chain guide is probably in need of replacement, most are.
    gggGary likes this.
  7. nj1639

    nj1639 Paleo-simplistic Top Contributor

    The First thing to check.
  8. Yep. Metal in the oil is most likely aluminum from the cam chain tensioner or brass from digested sump filter screen.

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