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First Cafe Racer Mod! 1983 XJ750 Maxim

Discussion in 'XJ Modifications' started by May_J_Aaron, Jun 24, 2018.

  1. May_J_Aaron

    May_J_Aaron Josh May

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    96FD9C42-5F2E-46FD-B46B-590884F0348B.jpeg Hmm I can’t get a solid read on the fuel sending unit, I got a read from 8-290 ohms a couple times but 98% of the time I just get random numbers, does that mean my unit is trash?
    There’s no consistency even though it has solid contact, no rust or corrosion.
     
  2. XJ550H

    XJ550H Well-Known Member Premium Member

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    needs a little cleaning and adjustment.
    there is past thread was about /adjusting sensors

    set your meter to 200 ohms see if you get a smoother reading
     
    Last edited: Apr 28, 2019
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  3. Polock

    Polock Well-Known Member

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    put a little oil on the wiper
     
  4. May_J_Aaron

    May_J_Aaron Josh May

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    So the fuel sending unit that came with the tank was faulty, wired coils were loose and it gave many random readings!
    IF ANYONE WANTS IT, just pay for shipping!

    I had to buy one off eBay for around $40, works well but the inside of the float is a little worn... should be ok though!

    My Acewell MD052-253 gauge works perfectly for my configuration!
    (They have multiple configurations)
    It allowed me too add the fuel gauge meter, make everything digital and the next test once I kick it over again is to connect the analog-to-digital speed sensor adapter to the gauge that also came from Acewell made specifically for our bikes! No need for magnets!

    Now I just have to figure out to to clean up these wires and get them stashed away without stuffing them into the headlight... those fins tend to get hot and I don’t want to melt any wiring in there!
    2487D735-FCA3-4281-BD8E-3EFBED62A987.jpeg 35BE3B45-B3A0-4643-8A4B-39B37EBCB7C2.jpeg image.jpg image.jpg
     
    Last edited: Jul 12, 2019
  5. May_J_Aaron

    May_J_Aaron Josh May

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    GLORY DAYS!!!!
    She started up today!
    After installing the Spin On Filter from chacal, I oiled her up again, put some new fuel lines on, added a fuel filter, and started her right up!
    She started like crap with the carbs needing adjustment and dumping a bunch of fuel out of the air box hose which stopped eventually...
    but now I take off the carbs, ship them to Hogfiddles, let him work his magic while I inspect the valve shims!

    The fuel gauge read accurately, it idled well, but accelerating killed the engine.
     

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  6. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Check the oil level. Remove the oil fill cap and sniff.
    The only way for fuel to get to the airbox is for it to have filled the crankcase.
    A gas-filled crankcase will stall an engine, and that's the best of the possible results in that scenario.
     
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  7. May_J_Aaron

    May_J_Aaron Josh May

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    I think I was leaving the Prime on and it kept flowing....
    I was watching the fuel flow through the filter thinking it was just filling up the bowls until I saw the puddle at my feet!
    That’s a great suggestion so I just gave a sniff and it smells nice and oily!
     
  8. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Even when set on prime raw fuel should never get into anywhere but the float bowls. Your float needles were either leaking, or the floats were stuck.
     
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  9. May_J_Aaron

    May_J_Aaron Josh May

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    It hasn’t ran since May of 2018.... I vote stuck!
    I’m going to be sending them over to Hogfiddles to get the professional checkup since I don’t want to be chasing vague issues or screwing anything up when it comes to the initial overhaul!

    Time to check some valves and do some more painting!
     
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  10. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Maybe. It's pretty uncommon to find any used bike that doesn't need the rubber parts replaced.
     
  11. May_J_Aaron

    May_J_Aaron Josh May

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    Looking inside my intake, the barrel look VERY clean but deep inside looks like it has quite a bit of funk, should I spray anything in there to clean it out before I slap the rebuilt carbs, new shims, boots and seals on?
    Perhaps Seafoam????
    9A5DAEA5-51A4-401E-98BF-073940880D48.jpeg 9671CE02-E64A-4CE9-9D73-754B0DD892ED.png
     
  12. Polock

    Polock Well-Known Member

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    just put that back together
     
  13. May_J_Aaron

    May_J_Aaron Josh May

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    I'm still waiting on parts to arrive... They just look really dirty so I got to thinking that maybe I can spray something on them to break it up, perhaps it'll help it perform cleaner and more efficient, even if it's only a small degree.
    I was thinking of Seafoam to sit on them just before I start mounting the carbs and then start the engine again to blow it out!
     
  14. Polock

    Polock Well-Known Member

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    if the head was off and the valves were out of the way then you could clean it up and get the gunk OUT of the engine. just putting something on it probably won't take any off, but if it did, it goes in the cylinder. now think about this. the head is off, you scrape and wire brush a bunch of that stuff off and catch it, what are you going to do with it?
    throw it on top of the piston?
    if you want a tiny increase in flow, hold the intake tube on the head and feel for a ridge where the intake meets the head, get rid of that
     
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  15. May_J_Aaron

    May_J_Aaron Josh May

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    Freshly painted valve covers!
    Fitz write up was great!

    Strip it-
    108DE924-3D52-4B3D-815D-021E570FD0DF.jpeg

    Sand the ribs- (250,500,1000)
    32F4AD7E-68C2-42F6-8914-2B99349FD5BF.jpeg

    Paint and scrape- (wait 20 minutes before scraping)
    00926D92-7FE8-4D47-B448-5198274F8BBD.jpeg

    -Wait 5 days-
    Block sand and polish ribs again! (500, 1000, 1200, 2000) Finished with some White Diamond polish
    AE401058-8ADF-4B29-8E38-AE259B085687.jpeg

    I taped it up around the ribs to prevent any scuffing, otherwise I would have ruined the surrounding paint
     
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  16. May_J_Aaron

    May_J_Aaron Josh May

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    Had to give these old bolts heads some love too!
    Same treatment as the valve cover ribs ^^^
    03A389D2-D418-4381-818C-BA685A3A548E.jpeg 47A97D6F-0849-4815-A80C-7D5973653D54.jpeg
    :rolleyes:
     
  17. XJ550H

    XJ550H Well-Known Member Premium Member

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    there are instructions online for plating. looks easy enough to do using a battery charger
     
  18. May_J_Aaron

    May_J_Aaron Josh May

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    Plating sounds interesting!
    I just gave these a smooooth polish, definitely worth it!
    2E6655AE-4151-4D76-BE4F-18F6ED503CD9.jpeg
     
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  19. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Very nice work!
     
  20. Polock

    Polock Well-Known Member

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