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83 750 seca timing chain

Discussion in 'XJ Technical Chat' started by blue2cooter, Mar 20, 2007.

  1. blue2cooter

    blue2cooter New Member

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    i just put a new head on my seca and when i put it all back together the valves are out of time any help on how to set the timing chain would help thanks
     
  2. bosozoku

    bosozoku Member

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    From the XJ CD-file ENGINE_TRANSMISSION/changing_the_camchain.htm

    "Rotate the engine so the 'T' mark is aligned with the pointer. Re-install each camshaft so that the index mark (a little circular depression on the land of the camshaft just to the left of the gear) is exactly on top and the gear is sitting loose over the tunnel with the bolt holes lined up. Re-install the camshaft bearing caps and tighten gradually and evenly with a torque wrench. Install one bolt on each gear. Check that the index marks are still on top dead centre while the 'T' mark is still aligned with the pointer. Rotate the engine back 1/8 turn, then forward so the 'T' is again aligned. double check the index marks one more time.

    Loosen the set screw on the chain adjuster, retract, and tighten the set screw (manual models) or remove the rear bolt holding the spring, pull back the ratchet tang, and retract the adjuster (automatic models). Re-install the adjuster with a new gasket. Loosen the adjuster set screw (manual models) or gently push in on the piston with a small screwdriver or allen key (automatic models) to take up some of the chain slack. Rotate the engine two full turns, and ensure the index marks are at TDC with the pointer aligned with the 'T' mark. Rotate the engine enough to install the other two bolts on the camshaft gears.

    Rotate the engine so the 'C' mark lines up with the pointer. Tighten the set screw (manual models) or re-install the springs and retaining bolt (automatic models). Re-install the cover and carbs.

    tafn

    dv"
     
  3. RickCoMatic

    RickCoMatic Well-Known Member

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    When you line-up the "T" ... visual check to see that it's the #-1 Piston at Top Dead Center.

    Look on the Camshafts for the markings that indicate if its the Intake or Exhaust Cam ... mixing 'em up has been known to happen. You won't like the results if they are accidentally swapped!

    After you get the whole job done. Turn-over the engine ... by hand ... for at least two full revolutions ... and stop jacking the engine over with the "T" lined-up and #-1 Up TDC ... look for the dimples in the sight holes, again ... if they aren't lined-up ~~> Perfectly <~~ do the whole process again.
     
  4. blue2cooter

    blue2cooter New Member

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    thanks man i needed the help but i think im 180 degrees out so back to it tomarrow do you know if the carbs would pull air if i was 180 out?

    bill

     
  5. RickCoMatic

    RickCoMatic Well-Known Member

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    If you were 180-Out ... you'd of known ... real quick. You'd have had an Open Valve at the wrong time ... and a piston would bump into it.

    The kind of "Oh, no! No-no" that the whole neighborhood gets to share with you ... as you suddenly realize how really badly you just messed-up and run out to the end of the driveway, put your hands on your knees and spew until you eventually start to cry.

    Big hurt.
    Bent valves hurt.
    Hope you didn't do that.

    I doubt you did ... because, like I said ... you'd of known -- immediately!
     
  6. blue2cooter

    blue2cooter New Member

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    ok now its running at full throtle so whats the deal i start it and it revs all the way up i backed out the idle all the way the throtle cable has slack the choke is off everything is hooked up and it red lines as soon as i start it

    would it do that if i was one tooth advanced in the timing or maybe a tooth delayed? i really dont want to give up on it but i cant afford a mechanic right now please help
     
  7. RickCoMatic

    RickCoMatic Well-Known Member

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    No ...

    Look at the carb linkage.
    Disconnect the throttle cable
    Pull the part stuck below the the intake manifolds free so the linkage can actually close.

    Yes ... you have to pull the carbs or it ain't coming free and if you break it off trying to sleaze-it by ...

    You are totally screwed.

    Use a plastic tie to hold it in place so it don't get snagged-up again.
     
  8. Robert

    Robert Active Member

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    Sounds like you've got something hanging the throttle valves open or you have the enrichment circuit wide open, make sure it is seated.
     
  9. RickCoMatic

    RickCoMatic Well-Known Member

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    Common mistake putting carbs back on the 750 and 900 ... the Throttle Cable swivel attachment on the carb linkage gets tucked-in under the inside edge of the engine.

    Loosen the rack, tilt the carbs back and lift it out.

    Pry it loose and you will most likely:
    A. Break it off
    B. Bend the linkages and scrap the whole rack
    C. You need a C ??? ... like A & B ain't bad enough!!!

    Join the Club ... anybody who has pulled carbs on these bikes gets burned by doing this ... it's a Rite of Passage ... laugh about it later.

    Look carefully at where the throttle cable connects to the rack ... its stuck; right???
     
  10. blue2cooter

    blue2cooter New Member

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    well i think i have earned my right of passage :
    1. this is my first motorcycle mechanical work
    2. project one backfired in my face when i snapped of two bolts in the head
    3. put on the new head and had the timing of by one tooth on the air side and 3 teeth on the exhaust side
    4. took it all apart again and fixed the timing chain (thank you sooo much bosozoku and RickCoMatic )
    5. then the carb malfunction which i dont care to share what the problem was (i felt like an idiot after i figured that out)
    6. now it has no balls and needs a tune up very badly

    so the moral of the story IVE LEARNED ALOT ABOUT MY SECA AND DONT WANT TO DO THIS AGAIN!!!!!!!
     
  11. Fraps

    Fraps Member

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    No WAY! This is the fun part!!!!

    Nothing like making it run and run WELL because of your hard work. Very satisfying in my opinion.
     
  12. RickCoMatic

    RickCoMatic Well-Known Member

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    Well ... we got to be getting closer.

    You had it high-revving and know it's timed right ...
    All we have to do is tune it ...

    Like Arnold says: "Vee godda "pomp - hue - hop"

    What are we doing first? Sync? Mixtures?? Exorcism??
    Let's go!
    Gee-did-own! Ring-da-gong!
     
  13. blue2cooter

    blue2cooter New Member

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    ok well the seca is off at the mechanic so we will see what he knows he's a friend and just started his own shop and never worked on a bike like that so he's trying the tune right now but i have another motorcycle and its a 1980 kawasaki LTD 250 its in almost perfect condition and has just under 9000 miles on it does anyone know what the idle speed is supposed to be i think its idleing fast (1800 rpm) i know wrong bike not a XJ but its a nice little bike and hell it gets 82 mpg
     
  14. RickCoMatic

    RickCoMatic Well-Known Member

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    Shoot for 900 - to - 1050 that ought to good.

    Regarding the mechanic who is servicing your bike. You NEED to ASK -- (I'm writing "ASK" -- what I really mean for you to do is DEMAND) -- to know if he is going to Synchronize the Carbs using a YICS TOOL.

    The ONLY accepatable answer is: YES.
    You like to see the tool -- please.
    You'd also like to be there when the sync is performed.

    If he doesn't have a ColorTune Plug -- YOU buy one. Insist he use it to tune your bike -- deduct some dough off his bill for you letting him use your ColorTune Plug.

    If he balks ... or tells you he can tune it without the YICS Tool and the ColorTune Plug ...

    Tell him ... "NO, you can't. You don't want your bike tuned WITHOUT the YICS Passages blocked-off. You want the job done right and want to be there to watch.

    Don't waste any money paying somebody who can't do it right. Save the money ... buy the tools ... and then PM me to email you my phone number.

    You call me and I'll "Talk you through" tuning it up BETTER ... yourself!
     
  15. blue2cooter

    blue2cooter New Member

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    hey i got it and when i get it back i am checkin the carbs and if there not clean i am canceling the check i hate to do stuff like that but i havre to keep them on there toes i will order those tools i love my seca and might have another one in a week or so thanks man i will keep you updated and actually hope to talk to you some time
     
  16. RickCoMatic

    RickCoMatic Well-Known Member

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    Clean?
    Clean is something everybody ought to be able to do.

    Tuned?
    That's a whole 'nuther situation.
    There are guys who will tell you they can tune your bike without the YICS Tool. They can be VERY convincing. They want your dough!

    You have the RIGHT to DEMAND that the job is done correctly.
    For that ... you need the YICS Tool.
    I hope the guy is legit and does it by the book.
     
  17. blue2cooter

    blue2cooter New Member

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    ok i ordered a ColorTune but where can i find a YICS tool ??? ive looked around but couldnt find one
     
  18. RickCoMatic

    RickCoMatic Well-Known Member

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    I actually made the one I have from plans available on the Web. You can find everything you need at a well-stocked Hardware Store ... and get change back for a five!
     
  19. Robert

    Robert Active Member

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    Cooter, there is a link at the top of the page in our XJ Chat forum. One of our members makes a trick carbon fiber unit for a very reasonable price. I spent a little time and, using a diagram I saw on another forum years ago, built my own in about an hour taking my time. Run be about $10 for the parts with enough left over to make another.
     
  20. blue2cooter

    blue2cooter New Member

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    yeah he "cleaned" the carbs there was no tune done i have to do that i put it all back together today and went for a quick ride in the 30 degree weather it runs a hell of a lot better but it still needs the tune i have a carb rebuild kit commin and yes i should have just done that in the beginning but im still learnin i found some plans for a YICS tool and will build that this weekend i have to wait for the "ColorTune" i have time though the weather is going to be crapy for a while one thing i want to do is put the factory exhaust back on it any recomendations for mufflers?
     
  21. Robert

    Robert Active Member

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    Sorry, I've no good news to offer. New stock exhausts are as hard as finding a football bat. I've had the good fortune to not have need of new parts yet (heaven help me keep it that way). There is this nice fellow down in New Zealand who spent a considerable amount of time and money to piece together a stock appearing system out of stainless steel. His link is in our links section. Amazing work but it isn't something you or I would have access too readily. If you want something bad enough, you will find a way. I expect someone else will have some recommendations for you.
     
  22. RickCoMatic

    RickCoMatic Well-Known Member

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    The closest "Replacement System" that will provide STOCK (Factory) Jetting is made in Great Britain by MOTAD, and designed specifically for the XJ.

    Although its a: 4-into-1 System. It purports to be exceptionally quiet and meet the strictest noise abatement standards in UK.

    MSRP: $459.00 -- Add Tax and Freight.

    Let's see ... 4-59, plus ... percent, ... carry the one ... plus FREIGHT ... Wow!
    You'd need to put one of your Kidney's on eBay!
     
  23. stevo32

    stevo32 Member

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    WELL BRO U DONT EVEN REALIzE HOW MUCH U JUSDT HELPED ME IM SO LUCKY THAT MY TIMING IS SO FAR OFF THAT IT WOULDN'T CRANK SO I DIDN'T
    BEND ANY VALVES.
     

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