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What did you do to your Yamaha today?

Discussion in 'XJ Technical Chat' started by Cutlass84, Jun 4, 2007.

  1. Colin 85 700

    Colin 85 700 Active Member

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    Did the bracket fit the carb? Or did you twist it like that?
     
  2. LarryMc

    LarryMc Active Member Premium Member

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    That bracket is a duplicate idle speed screw bracket from a junk set of BS28 carbs. Yes, I twisted/bent it. The screw extender came from ebay with no means of attaching it so I improvised.
    I'm sure it's from a later year Yamaha that had Mikunis. I'm doubtful it was off a FZR750 because they ran Keihin carbs mostly and the carbs were covered by a fake gas tank plenum. Who knows?
    I knew the screw threads were the same so I snagged it for $12.00. I have trouble accessing the idle speed screw in its usual location plus it gets pretty toasty there also.
    Works great for me.
     
    Last edited: Dec 17, 2018
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  3. turpentyne

    turpentyne Active Member

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    NO! I don't like that idle screw at all! ... because I put my carbs back on a couple weeks ago, and now I wanna do that!
     
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  4. LarryMc

    LarryMc Active Member Premium Member

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    Pull them off the bike and install one. There are at least a dozen on ebay right now for sale. I just looked, seriously.
    Pulling and reinstalling the carbs gets easier each time you do it, once you figure which way works best for you. You got this....
     
  5. 78dave

    78dave New Member

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    New throttle shaft seals did not help with hard starting when cold.
     
  6. LarryMc

    LarryMc Active Member Premium Member

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    Check your valve adjustment, make sure your getting good spark, is your battery charged up completely and if it's really really cold where you live these bikes can be real twats until they are warmed up.
     
  7. 78dave

    78dave New Member

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    I will say I think I did get an improvement when the choke is off. Mine has never run for any duration with full choke. But now when I use the choke a few times then go without it I notice a longer very slow run as it is trying to warm up and I can lightly dial in some throttle. Yes cold here.
     
  8. LarryMc

    LarryMc Active Member Premium Member

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    Sounds like you might have a vacuum leak or a screwy enrichment plunger. Something along those lines. The first thing to do is check your spark plug color and that will tell you a bunch of info. Without seeing the plugs, I'll venture a guess that your bike is a little on the lean side from what you've told us. Pull the plugs, get a new set and fiddle a bit with your mixture ratios or Colortune. If you don't have a Colortune, get one.
    My finicky cold start issue went to starts with no or little choke after I bought a Colortune. Also I was surprised how much the mixture screw settings varied between each other.
     
  9. Abaton6

    Abaton6 New Member

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    \What does Rick charge for the carb rebuild?
     
  10. LarryMc

    LarryMc Active Member Premium Member

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    Got some ME time today and got everything 99% put back together.
    20181225_151710.jpg 20181225_151527.jpg
     
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  11. xHondaHack

    xHondaHack Active Member Premium Member

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    Larry, that looks awesome! Saw your other thread where you got some ride time on it.

    Wish I had more time to document all the stuff I've done or plan on doing.
    In the meantime, here's a snap shot of the parts bike build after my 20 mile shake down run today:
    upload_2018-12-29_19-35-51.jpeg

    I do have the "5 Valve" carb and airbox trim pieces. I'll be installing those after the final jetting when the weather gets warmer.
    One of these days I'll do a build thread with close ups and details on all the mods and improvements.

    Tony
     
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  12. LarryMc

    LarryMc Active Member Premium Member

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    Thank you.
    Your ride is undoubtedly very nice. Great work on keeping it up.
    Let us in on what work you have done.
    Its always interesting to see what others are doing to there bikes XJs or not.
     
  13. LarryMc

    LarryMc Active Member Premium Member

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  14. Joeoeo

    Joeoeo New Member

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    Rainy day here so I spent it doing what was sorely needed...

    before.jpg

    after.jpg
     
  15. Tim O

    Tim O Active Member

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    I have the same one... warning, I had to tuck it farther up under the tank as the seat was pushing hard on the top of it even with the plastic plate removed from the seat.
     
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  16. Joeoeo

    Joeoeo New Member

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    hmm ill keep an eye on it. seemed like there was enough clearance to not have issues, ive heard of people also using seat spacers to lift the seat a few mm
     
  17. LarryMc

    LarryMc Active Member Premium Member

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    * Update *
    Regarding the extended throttle adjustment knob installed during my carb overhaul:

    The mounting point off the carb bowl screw didn't work out. It also created a conflict when reinstalling the carbs.
    With the same mounting bracket flatten out and a larger diameter hole, the upper starter mounting bolt was replaced with a slightly longer one and the knob fits there nicely. Pulling and installing the carbs is not an issue with this mounting point. Just let it hang until the carbs are secured then install the bolt back on the starter. The idle is easily tweaked here, if needed.
     
  18. Jetfixer

    Jetfixer Well-Known Member

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    Just came home 50 degrees, started bike up , been sitting for a few weeks . I WANT to ride , but have bike tucked on side wall just right to get my truck in garage...must resist now if we get no real snow for rest of winter:D
     
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  19. Chitwood

    Chitwood Active Member

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    Hit 45 here today...if it wasnt for all the salt on the roads I would have pulled it off the breezeway and went for a rip
     
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  20. Franz

    Franz Active Member

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    Yes l don't mind the cold but the road salt is bad. Hopefully winter will be mild time will tell.
     
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