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XJ750J Refurb

Discussion in 'XJ Technical Chat' started by turpentyne, Jul 5, 2018.

  1. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Exceptional (and funny, you're a great narrator/editor). Of course it needs to go into the how-to section!
     
    Jetfixer likes this.
  2. Jetfixer

    Jetfixer Well-Known Member

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    Your video is good definitely need to be put in the how to video file.
     
  3. turpentyne

    turpentyne Active Member

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    Wellll, bummer. Taking suggestions on something....

    I cleaned up the fuel sending and added new gaskets. Before putting it on the bike, I threw a little gas in to make sure it wouldn't pee all over the place.

    But it did.

    Here's a before & after pic. Now I suspect the PO tried (badly) to fix the wrong spot. It's leaking around the plastic insulator for the green wire attachment. Any thoughts? I could probably put a little... something... around it, but then I'm just doing same as the last guy. Or give up and get a new one? I so hoped to get this bike started this weekend -- and not have to buy a new sending unit.
    [​IMG]
     
  4. Jetfixer

    Jetfixer Well-Known Member

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    Thourghly clean area mix up JB weld (not JB quick) let it set 24 hours at least 50 degrees or above . Cover area over bolt head and around area washer . I have an aftermarket aluminum engine case in my 71 VW 1776 cc the oil pressure sending unit boss cracked off , I fixed it with JB WELD about 8 years ago it withstands 60 plus psi of oil pressure with no leaks .
     
  5. turpentyne

    turpentyne Active Member

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    yeah... I figured that might be the suggestion. I covered the connection with Ultimate Black J-B weld an hour ago. Time to work on other stuff, I guess.

    It annoys me that there's a NOS sensor on eBay for over $100 bucks. I guess it's become unobtanium. (or is it unWantium?)
     
  6. Jetfixer

    Jetfixer Well-Known Member

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    Let it set up over night .
     
  7. XJ550H

    XJ550H Well-Known Member Premium Member

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    that is a good price for new old stock. not many used ones because you need it to sell a fuel tank. if you do not need the fuel guage xj4ever sells a blanking plate

    also a used tank may be an option, but considering that you have an XJ750J that bike is a 1 year model, just as the XJ750K is a 1 year model (style)
     
  8. turpentyne

    turpentyne Active Member

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    Yeah, I might get the blanking plate eventually. I wanted to keep everything as original as possible, but I understand these are apparently no more reliable or accurate than poking a stick in - or just looking. :)
     
  9. XJ550H

    XJ550H Well-Known Member Premium Member

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    I use my trip meter to tell how much fuel I have in the tank my fuel guage is just to fickle to the slosh to be reason I get fuel.
     
    Chitwood likes this.
  10. turpentyne

    turpentyne Active Member

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    Yep! The RTV took care of that leak! Today I put the tank on, and managed to get it started. Keeps dying after about 10-20 seconds of running, So I gotta figure that out tomorrow....
    but it's sure nice to know she's still kickin' after a year of being silent!
     
  11. XJ550H

    XJ550H Well-Known Member Premium Member

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    keep an eye on the rtv it will break down after some time in contact with gas
     
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  12. turpentyne

    turpentyne Active Member

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    Oh! Bummer. It said it resists oil and petroleum products, so I assumed it was ok. Maybe a little dumb on my part!
     
    Last edited: Dec 23, 2018
  13. turpentyne

    turpentyne Active Member

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    Took my first stab at using the carbtune. The carbs went through a complete break-down and church-cleaned. The mixture screws set right at 2 1/2 turns. First I put the color tune on there, I got blue, but with some white pops and the idle was hanging like a banshee, higher with each turn. Basically, acting like it was lean... or maybe just wayyy out of synch.

    So I dropped the main idle screw to about 1200 rpm, and tried out the carbtune. When I got everything dialed in, it definitely seems to have gotten rid of (most of) the hanging idle, but I was surprised how low the steel bars were. I would've expected higher. Where should they be?

    Here's what I've got right now. thoughts on what you hear?

     
  14. XJ550H

    XJ550H Well-Known Member Premium Member

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    idle rpm is 1050


    your bars are equal and rise equaly thats always good
     
  15. turpentyne

    turpentyne Active Member

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    oh! A little lower than I'm setting it. ok.. I'll adjust. I just came back in from fiddling with it. This time the bars were a little higher, around the 12-mark, so that's more like I expected.

    Unfortunately, any more fiddling will have to wait. Time to help someone put an outdoor fire pit thing together.
     
  16. turpentyne

    turpentyne Active Member

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    Seems the bike is dialed in, more or less, but I'm curious about opinions on the start-up.

    The last three weekends I've started it up, to do a little more fine tuning, but I notice after a week, I have to spray a little starter fluid down the airbox the first couple times. Choke's wide open, and from what I understand I shouldn't often need that. I'm in icy-cold Phoenix, where it's a whopping 63 degrees here in the dead of winter. (18 C to the rest of the world).

    I'm running off a little fuel container with a simple on-off switch, at the moment - not the tank with its vacuum petcock. I wouldn't think that had anything to do with it.

    Thoughts?

    (ps. the carbs were taken to church for a 100% teardown and rebuild with new jets and whatnot.)
     

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