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to the max... gonna need some pointers (thanks in adavance)

Discussion in 'XJ Technical Chat' started by to the max, May 26, 2018.

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  1. to the max

    to the max Member

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    we have here a 1986 xj700n with 10k on the clock. picked this up for $300... score (i hope).
    this is my first bike so i'm excited to make this thing work.

    last tagged in '08 so i'm assuming that's the last time it ran... where do i start?

    already downloaded the FSM. ( thank you xj550)

    i already drained the oil to put new in and the o-ring broke on the filter cover screw. i'm assuming autozone will have an o-ring that will work in one of their multi-packs. it had 2.5 qts in the case. i'll be ordering a filter

    any advice on things i should look for, be prepared for, would be appreciated.

    i'm a mechanic and can trouble-shoot electrics.

    my list right now...

    - starter circuit trouble-shooting ... starter motor doesn't work from the switch.

    - pull the spark plugs to inspect

    - the "broken gas thingy" , order a whole new gas cock?

    - there are three hoses that look like supply lines connected to the front of the carbs, they aren't connected to anything. guessing i'll find see where these go in the service manual

    -vacuum line with a screw in it... hmm
     

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    to the max, May 26, 2018
    #1
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  2. XJ550H

    XJ550H Well-Known Member Premium Member

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    I would order the correct o rings from member Chacal (Len) also get a new petcock you can get a manual one or vacuum opperated one . again chacal has the correct ones
    that petcock you have is junk replace it. vacuum hose with plug is what goes to petcock, just get a cap for it like the other cylinders have if you go to a manual petcock.
    the extra hoses on the carbs are overflow hoses.

    the one with the ring clamp is the fuel line to carbs from petcock
    fuel guage is an ebay part or just put a blocking plate on the tank again chacal may have some.
    tank looks like it has bondo or a patch near mounting holes
     
    XJ550H, May 26, 2018
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  3. XJ550H

    XJ550H Well-Known Member Premium Member

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    starter circuit .
    does starter turn when jumped at solenoid?

    you can test starter button from small wire at solenoid disconnect connector , meter to battery other lead to connector when you press starter button you should see 12 volts . starter button makes the connection to ground
     
    XJ550H, May 26, 2018
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  4. to the max

    to the max Member

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    getting 12v to the starter... but it's lifeless. the windings appear to be fried right in two. open circuit from the "hot" post to the frame
     
    Last edited: May 26, 2018
    to the max, May 26, 2018
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  5. Jetfixer

    Jetfixer Well-Known Member

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    Good chance your carbs will need to got to church ( full rebuild xj4ever will have full kit and most important the butterfly shaft seals note 2 on each carb body one on both sides the kits on eBay do NOT have these seals) you bike looks good keep the stock airbox ....resist putting pods on ...unless you want to keep experimenting with jetting.
     
    Jetfixer, May 27, 2018
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  6. to the max

    to the max Member

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    noted... thanks
     
    to the max, May 27, 2018
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  7. Rooster53

    Rooster53 Well-Known Member Premium Member

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    The open is more likely caused by the connection between the brushes and the commutator ring. A starter clean and rebuild should bring it back to life.
     
    Rooster53, May 27, 2018
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    to the max and XJ550H like this.
  8. to the max

    to the max Member

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    it's spinning!!!... gonna hook up a gas supply and see if she'll run
     
    to the max, May 27, 2018
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  9. XJ550H

    XJ550H Well-Known Member Premium Member

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    what did you do to get it spinning?
     
    XJ550H, May 27, 2018
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  10. to the max

    to the max Member

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    cleaned the commutator with 400 grit sand paper and sprayed it with MAF sensor cleaner. it's cranking at the moment but wouldn't fire up. i'm not sure what sequence to do with the choke. and for some reason the throttle grip won't turn
     
    to the max, May 27, 2018
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  11. XJ550H

    XJ550H Well-Known Member Premium Member

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    throttle cable frozen you could try lubing it but it will brake soon.could be the throttle tube is gummed up to.
    turn on choke do not touch throttle hit the starter button as bike warms up rpm will climb and climb.

    put a meter on your battery when you press starter button se what the voltage drops to under 10 volts tci will not fire. charge battery or replace.
    if the starter is bad it can also draw voltage down.
     
    XJ550H, May 27, 2018
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  12. Minimutly

    Minimutly Well-Known Member

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    Whatever you do - don't start it untill you sort the carbs and or linkage out, if they stick even slightly open the revs will climb alarmingly - even if you are quick to kill it. And any way, whats the point if you can't blip it?
     
    Minimutly, May 27, 2018
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  13. to the max

    to the max Member

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    10 yr old gasoline?
     

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    to the max, May 29, 2018
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  14. to the max

    to the max Member

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    the carbs are gummed up solid. floats don't budge. should i just assume a complete rebuild is needed? do i have to take the hats off?
     
    to the max, May 29, 2018
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  15. Minimutly

    Minimutly Well-Known Member

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    Full strip down, split the rack, replace the shaft seals - but only if your confident, there are a lot of little bits to mislay.
    You could take the tops and bottoms off, strip everything and clean and refit, but the shaft seals aren't accesable unless you take the whole rack apart.
    There are people on here who could do it for you?
     
    Minimutly, May 29, 2018
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  16. to the max

    to the max Member

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    noted. thanks!
     
    to the max, May 29, 2018
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  17. to the max

    to the max Member

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    to the max, Jun 2, 2018
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  18. to the max

    to the max Member

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    to the max, Jun 2, 2018
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  19. k-moe

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

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    k-moe, Jun 2, 2018
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  20. to the max

    to the max Member

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    prepping the carbs for rebuild. i'm guessing the hole at the end of the milled slot, and the smaller hole at the bottom of the bowl, are connected in the wall of the bowl. are they?

    does this hole have a name?
     

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    to the max, Jun 19, 2018
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