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1978 Xs650SE Barn Find

Discussion in 'The Garage' started by ElCamMan515, Jun 25, 2020.

  1. ElCamMan515

    ElCamMan515 XS650 Enthusiast

    Well some bad news. Got home and found out the boots are the wrong ones. I was sent a set for BS34 carbs not BS38. Will contact the company tomorrow. The saga continues haha.

    Tim
     
  2. 5twins

    5twins XS650 Guru Top Contributor

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    Yes, the BS38 manifolds are harder to find, especially the '78-'79 type with the vacuum nipples like your bike has.
     
  3. ElCamMan515

    ElCamMan515 XS650 Enthusiast

    @5twins I ordered from PartsGiant. The ones they have only show 1 picture for the bs38 and they did not appear to have the nipples which is fine bc I am not running a vacuum petcock.

    I will give them a call and get everything sorted out.

    Tim
     
  4. Machine

    Machine Race the wind Top Contributor

    20210419_183130.jpg
    77 BS38 carb holders can be found.
    pm if needed.
     
    ElCamMan515 likes this.
  5. ElCamMan515

    ElCamMan515 XS650 Enthusiast

    I made contact with PartsGiant. I have shipped the boots back for an exchange for the correct boots.

    Tim
     
    Team Junk, Mailman and jetmechmarty like this.
  6. 5twins

    5twins XS650 Guru Top Contributor

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    I looked on that site but couldn't find any 650 carb boots. Got a link?
     
  7. ElCamMan515

    ElCamMan515 XS650 Enthusiast

    Here is the part #350079
     

    Attached Files:

    Greyandridin likes this.
  8. ElCamMan515

    ElCamMan515 XS650 Enthusiast

    Good evening everyone,

    Small, but big update. After waiting over a week for the new correct carb boots to come in, I was eager to get out to garage. I got everything back installed and got the bike running after charging the battery.

    The bike seems to run way better than before and the rpms does not hang like it used to. I have attached pictures below of the right and left cylinder timing. Left is first picture. Right is second picture .
    At 3k rpms the advance is near the mark. (Sorry no pictures). Also below is a short video of how it idles with some throttle blips (you can see rpms in video). What are your thoughts everyone?


    Also, I checked the voltage across the battery terminals and it was 22.6v. What can cause the high reading??

    Thanks,

    Tim
     

    Attached Files:

    Raymond likes this.
  9. GLJ

    GLJ Never go faster than your guardian angle can fly. Top Contributor

    :yikes::yikes::yikes::yikes:
    I hope there is something amiss with your meter or something.
     
  10. ElCamMan515

    ElCamMan515 XS650 Enthusiast

    I just ran back out to garage to check the standing voltage and realized I had the multimeter set to the wrong setting. Standing voltage was 12.1v
     
    GLJ likes this.
  11. Jan_P

    Jan_P XS650 Junkie

    569
    837
    93
    Sweden
    The voltage must be around 14 V running
    Engine running
    Sounds more or less right .I get the impression it is a fraction very very very very little
    late although the strobe pictures don't show that
    I don't remember at what rpm the check should be done please check that
    I would leave it there for now and get some miles ..checking how plugs look.
    Later on a video on the cylinder heads with sound and blipping gives better info
    Now it is the Exhaust note dominating but again it sounds OK adjusted.
    Was it 5T that Nailed it the Intake Leak ?
     
    Raymond, Greyandridin and ElCamMan515 like this.
  12. ElCamMan515

    ElCamMan515 XS650 Enthusiast

    Jan- it was you and 5twins that suggested an air leak. I believe I had an air leak with the old boots and the advance rod sticking. Now that I lubricated the advance rod it does not hang when rev'd up as noted in previous posts and videos.

    I really appreciate everyone's help! I plan to take bike out for a good ride this weekend with a buddy.

    Tim
     
    Raymond likes this.
  13. Jan_P

    Jan_P XS650 Junkie

    569
    837
    93
    Sweden
    Yes Sir
    Please drive carefully ...It happens when riding ..with a fresh serviced bike + friends that shall I say " Throttle Blipping "
    Happens out on the road also But since there might still be things unknown with the bike
    Some sort of Running in Driving can be a good starting point.
    Some leak would not be Impossible happen Have you Checked the Head Bolts ?
     
    ElCamMan515 likes this.
  14. ElCamMan515

    ElCamMan515 XS650 Enthusiast

    I have not checked headbolts yet, I have to borrow a torque wrench from my father in law. I'll check them this week.

    Do you know torque specs off hand?

    Tim
     
  15. jetmechmarty

    jetmechmarty What should I put here? XS650.com Supporter Top Contributor

    The nuts are 27.5 ft lbs. 15 ft lbs for the other four bolts.
     
    ElCamMan515 likes this.
  16. 5twins

    5twins XS650 Guru Top Contributor

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    Your timing looks pretty good. It's not perfectly matched cylinder to cylinder but that's no easy task, lol. You said the advance is around the mark. You want it at or before it but never past. If it's going past, you'll want to retard the idle timing a little more. You have a little more you can go because neither cylinder is at the right hash mark of the idle timing range yet.
     
    ElCamMan515 likes this.
  17. 5twins

    5twins XS650 Guru Top Contributor

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    Here's a drawing for torquing the cylinder head. I've revised my thinking on the big acorn nuts (#1 - 8). I wouldn't go over 30 on them. Going tighter doesn't really seem to help and just puts more of a strain on the studs .....

    [​IMG]
     
    Team Junk, gggGary and ElCamMan515 like this.
  18. ElCamMan515

    ElCamMan515 XS650 Enthusiast

    Jet and 5twins - thank you for the torque specs. When Leo was here he noticed some seeping from the head and told me that I should re-torque the head.

    5t- to clarify when rev'd to 3k rpm the timing mark is a sliver to the right of advance mark. This is a huge improvement from before when it was so far left you could barley see the mark bc it would go extremely advanced.
     
    Team Junk likes this.

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