1. Some members were not receiving emails sent from XJbikes.com. For example: "Forgot your password?" function to reset your password would not send email to some members. I believe this has been resolved now. Please use "Contact Us" form (see page footer link) if you still have email issues. SnoSheriff

    Hello Guest. You have limited privileges and you can't "SEARCH" the forums. Please "Log In" or "Sign Up" for additional functionality. Click HERE to proceed.

This damn machine is harshing my calm...

Discussion in 'XJ Technical Chat' started by jeffcoslacker, Aug 23, 2012.

  1. jeffcoslacker

    jeffcoslacker Member

    Messages:
    464
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    SW MO
    Pulled the carbs for the (3rd? 4th? I forget now, it's all a blur) time....trying to cure the difficult cold start it developed after I left town for a couple of weeks.

    Found lots of nice fine rust in the smaller jets and passages. And some pinholes starting to bleed fuel through the bottom of the tank. GDMFSOB...

    Ignoring the tank for now, since there's not a damn thing I can do about it, I cleaned the HELL outta the carbs (once again), got everything clear and moving perfect, put it all back together (even made connectors to put the fuel gauge wires back together that some MOUTHBREATHING TWONK cut rather than unplug)....and...it started right up!

    And proceeded to shoot to 6000 rpm and stick there.... 8O

    OK, so I got the #3 intake boot clamp interfering with the throttle linkage, right? Who hasn't done that...'cept I was pretty careful not to...

    And it turns out, I didn't. Throttle drops to base. Plates are closed. WTF?...checked the slides. Moving freely and dropping back to rest when I shut it off. Equally raised while it's having it's tantrum.

    I'm so aggravated I think I'm gonna have a stroke. Not only can I not explain it, it should even be physically possible...defies everything I know about motors after 30 years of working on them.

    Anybody know a priest that does exorcism?

    I'd put a buncha lead through it if ammo weren't so damn expensive...freakin' SOB. :evil:
     
  2. MercuryMan

    MercuryMan Active Member

    Messages:
    1,154
    Likes Received:
    1
    Trophy Points:
    38
    Location:
    Springdale, NWA
    Get an old TV and unload a couple of clips into it..you will feel better :) It's not possessed, if it was it would let you ride until your neck deep in heavy traffic and then die on you.

    Simple I know, but is your idle screw too far in? And you are putting your air restriction (box, pods, etc.) back on to run it right? What about your boots, after all that on and off are you sure they haven't developed a leak?

    Although I know EXACTLY how you feel, and I didn't enjoy being there either. Those feelings are bad for you, and won't help you in any way. You've got to pull back and regroup. It can only be a very small number of things going on, it can be solved.
     
  3. yamamann

    yamamann Member

    Messages:
    164
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Barrie, Ontario, C A N A D A
    Trouble cold starting after sitting - try this - battery weak, starter brushes worn drawing to much power from ignition coils, fuel on off not allowing fuel to carb bowls when on prime.

    Dirt in Tank - I would put an inline filter on gas line to stop crap from enering carbs until you get time to clean tank ( may as well leave a fresh filter in the line after cleaning the tank too )

    6,000 RPM - hmmm - hard to say, got to be fuel delivery related, too much or maybe even to little causing engine to lean out and rev up - maybe even an air leak in carb boots to cylinder - clean carbs again - blow out - double check needle valves and float levels.

    Watch to make sure gas does not drain into engine crankcase when running or just parked overnight or your in real trouble
     
  4. jeffcoslacker

    jeffcoslacker Member

    Messages:
    464
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    SW MO
    I'm glad I didn't change anything or I'd be convinced that was the issue...and then find out it wasn't, after undoing it...then I'd be REALLY aggravated.

    I MUST have the throttle cable/linkage mucked up somehow...but it sure looks like it's dropping to rest, and seems to have a normal amount of movement. Times when I've hung it on something after putting the carbs back on, I felt like something was wrong in the amount of pull available or feel of the throttle barrel...not this time...

    But it has to be. An engine simply cannot run that fast on closed throttle plates. I must be missing something.

    At least my fuel gauge works now. Yay me. LOL.
     
  5. jeffcoslacker

    jeffcoslacker Member

    Messages:
    464
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    SW MO
    While I'm thinking of it, I keep seeing references to problems with pod filters and wondering if someone could explain the issue in a nutshell, so I don't have to look it up?

    I'm guessing you get into some kind of issues with running bad....but kind of makes me curious as I've been running this one unfiltered since I got it, and when it runs, it runs GREAT....only thing is a little bit of bog before it picks up if you hammer it hard from low rpm...once spun up a bit, it takes throttle like cracking a whip...

    Is that the issue when people run pods on them?
     
  6. wwj750

    wwj750 Member

    Messages:
    371
    Likes Received:
    1
    Trophy Points:
    18
    Location:
    central minnesota
    Are the choke plungers closing all the way? Just asking cuz I had a similar problem and installed the cable linkage too tight, & left the plungers open a tad. These problems can be so damn frustrating, hang in there & good luck.
     
  7. yamamann

    yamamann Member

    Messages:
    164
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Barrie, Ontario, C A N A D A
    no idea on the pods slacker - what kind of bike is it ?
     
  8. yamamann

    yamamann Member

    Messages:
    164
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Barrie, Ontario, C A N A D A
    yes could be choke plungers - good idea
     
  9. yamamann

    yamamann Member

    Messages:
    164
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Barrie, Ontario, C A N A D A
    hey slacker stop being a slacker and add the type of bike you have to your profile info so we can all see what were dealing with lol
     
  10. jeffcoslacker

    jeffcoslacker Member

    Messages:
    464
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    SW MO
    '82 XJ750
     
  11. jeffcoslacker

    jeffcoslacker Member

    Messages:
    464
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    SW MO
    I had thought about the enrichening plungers, but checked out OK...new battery, and it had been starting very easily cold until left to sit a couple of weeks after tank cleaning...guess I missed some...

    Did put an inline filter on it after tank clean but while it caught a lot, it apparently didn't get it all...still found enough to hog up small passages in the carbs.

    interestingly, the emulsion tubes were fine...
     
  12. yamamann

    yamamann Member

    Messages:
    164
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Barrie, Ontario, C A N A D A
    not sure what else to mention - linkage somehow messed up - sync carbs to make sure everybody is pulling their weight at the same time will really improve off the line performance - I couldn't believe the difference in starting and take off performance - got to go off line soon - us wimpy Canuks ( NOT ) need to get our beauty sleep - good luck
     
  13. jeffcoslacker

    jeffcoslacker Member

    Messages:
    464
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    SW MO
    Yeah has to be something stupid I overlooked...no other explanation.

    Is your 750 3 hole a Special? Friend has a XS850 Special 3 cyl...neat bike. Sounds really unusual.

    I like those old RD's too.
     
  14. yamamann

    yamamann Member

    Messages:
    164
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Barrie, Ontario, C A N A D A
    It was a 750 triple special until I had to sell it cheap to quickly cover a debt at a strip joint one night - stay out of the VIP area my American cousin
     
  15. trickedout420

    trickedout420 Member

    Messages:
    90
    Likes Received:
    0
    Trophy Points:
    6
    Location:
    Greenwood MO
    when mine rev'd up to 9 grand and stayed it turned out the be the throttle cable adjuster by the throttle...a couple turns and we were sitting back at 1000 rpms
     
  16. jeffcoslacker

    jeffcoslacker Member

    Messages:
    464
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    SW MO
    :lol:
     
  17. jeffcoslacker

    jeffcoslacker Member

    Messages:
    464
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    SW MO
    How did it get changed though?

    I rode into the garage at 1000 rpm idle, took the carbs off and cleaned, put it back together the way it was and now I got the screamin' demon on my hands...
     
  18. MercuryMan

    MercuryMan Active Member

    Messages:
    1,154
    Likes Received:
    1
    Trophy Points:
    38
    Location:
    Springdale, NWA
    No filtration and your wondering why your small passages are getting clogged? Fuel isn't the only thing you want going in your carbs clean, and no the air doesn't just pass through and get burned. When you let off throttle there is exchange as vacuum drops and when you stop as well. Filters are a good idea.
     
  19. jeffcoslacker

    jeffcoslacker Member

    Messages:
    464
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    SW MO
    No doubt...but it hasn't really been anywhere. No plate, bad tires, no turn signals, got plenty to go yet.

    It just occurred to me that running the way it is when it DOES run right, with pods it would be acceptable. I haven't even run it with the OEM airbox yet...doesn't seem worth the effort to stuff those boots back in if I gotta keep taking the carbs off...
     
  20. moellear

    moellear Member

    Messages:
    858
    Likes Received:
    4
    Trophy Points:
    18
    Location:
    Lima, Ohio
    My guess is AIR LEAK. have you even bothered to use propane check?
     
  21. jeffcoslacker

    jeffcoslacker Member

    Messages:
    464
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    SW MO
    No, I use ether. And no, it's not leaking. I just replaced all the intake gaskets and inspected the boots last time apart. At least something is intact on this damn thing...

    I'm convinced I had to have hung the throttle somehow. I'm just not seeing it right. And too tired and frustrated to take it apart again tonight. I'll investigate tomorrow.
     
  22. adrian1

    adrian1 Active Member

    Messages:
    1,818
    Likes Received:
    6
    Trophy Points:
    38
    Location:
    Australia
    The tank pinholes can be soldered easily. I've done it. You need a good iron (at least 80 watts) and a wing man with a heat gun helps too. The repair is as good as permanent IMHO. Suggest you also get a good sealer to line the tank as well.
     
  23. MN-Maxims

    MN-Maxims St. Paul Minnesota

    Messages:
    3,067
    Likes Received:
    114
    Trophy Points:
    63
    Location:
    Saint Paul, MN
    It's hard to find a vacuum leak when the bike is running at 6K. But if throttle blades are truly closed and the engine is running like that, you have to think its getting air and fuel from somewhere.
    My best guess it would have to be combination of enrichment plungers not sealing and a intake gasket slipped out of place when installing. That happened to me once and I was flipped out untill I found what I did wrong. I had to come to the fact that if it ran ok before I started and now it's not. It has to be something I did. So it all came apart and sure enough it was my mistake.

    MN
     

Share This Page