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81 Seca 750 brake and light issues

Discussion in 'XJ Technical Chat' started by Timbox, Feb 12, 2019.

  1. Timbox

    Timbox Active Member

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    I just could not hold off, winter in WI driving me nuts. So picked up a Seca 750 R (I think) with a few miles on it. The battery cover is gone (normal) and the front brakes were locked up.

    Took the carbs to church, there were not that bad. I got a chance to use my sonic cleaner with the heating setting, that sure worked out good. Got them back together and bench sync is done.

    Tank was okay and looks like just a in-line filter should do the trick. If I see issues in the filter, I will soak it in Vinegar for a week or so to take care of it.

    Got the shims in the other day, but we are getting hit with a little snow here in WI, so I will not be heading out to the shop until the snow stops.

    My issues are these:
    1. The anti dive fork bleeders are broken off!
    [​IMG]20190211_134503 by Tim Brown, on Flickr
    On both sides.
    2. No headlight even though I have changed out the bus fuses in the head light bucket and main fuse system with spade type.

    I guess I just can't remember if this bike has a relay that keeps the headlight off until it start or not? I did check both headlight and driving light and they both are working.

    Here she is looking less than happy but getting some much needed TLC.
    [​IMG]20190211_134443 by Tim Brown, on Flickr
     
  2. XJ550H

    XJ550H Well-Known Member Premium Member

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    secs750relay.PNG you do have a headlight relay it also supplies power to the auxilliry light
    for headlight the relay sends power t o the high low switch then to the speedo then to headlight.

    alternator sends power to the diode on the white wire that is the power for relay. it will close when motor spins and starts generating power

    if the bike is an 81 it is a seca 750 no maxim that year
     
    Last edited: Feb 12, 2019
  3. Timbox

    Timbox Active Member

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    HJ550,
    Thanks for the heads up, I thought as much, just know some of the bikes had that. I will get the new shims in, seal up the cover, slap the carbs back on and throw some gas at it. I am hoping that she fires right up, then to work on backing out those nasty bleeders. I am thinking if I can't get to them with a back out, I will drive a old small flat tip in there and see if I can vise grip them out with the post sticking up.
    This is another bike with no title, so I am either going to try to get it done through Vermont or spend the $100 and six weeks of wait time on the bonded title here in WI.

    Again thanks for the schematic XJ550H :)
     
  4. Timbox

    Timbox Active Member

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    Tried to get those bleeders out after letting them soak. Broke two back out bits, used lots of heat and BP blaster. Boiled them a few times, then ended up trying to drill them out. I will just bypass them for now. I don't know if I can even drill them all the way out and re-tap that for a different size bleeder. So for now the lower brake line has been removed and just the lines going from the master to the calipers are there. Not too sure what that will have to offer, for now I am safe as roads are not ready to ride here in WI.
     
  5. Timbox

    Timbox Active Member

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    Got the shims installed today and the valve cover all buttoned up. Installed the new NGK spark plug caps and the carbs. Hooked up the AUX gas and tried to fire it up. Well she wanted to go but had to put my hand over the back and of the carbs even with choke on. I found out the the head to carb boots were so loose that it was not pulling air through the carbs. Have them cleaned up and will add a little gasket prep to them before they go back on. The engine sounds good with the new shims in, glad it started and the head light came on after it started.

    I have to look at the AUX light to see if it is burnt out or the swx. The throttle cable is a little stiff too, so need to work on that. Carbs bounce supper nice on the bench but that throttle cable is not rolling back. The PO must have done something to it.

    With the left muffler being totally shot, it was funny to start the bike up and listen to it growl.
     

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