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Carb Bench Sync?

Discussion in 'XJ Technical Chat' started by robut, Apr 8, 2013.

  1. robut

    robut New Member

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    Can anyone point me to a bench syncing tutorial. I've searched high and low, but can't seem to find one. I have successfully set the float heights (after discovering that my friend put them in upside down lol), and so I'm ready to sync these suckers.

    Valve clearances and motor running sync are on my books for this weekend, so I'm hoping to do the bench Sync this week after work sometime.

    Thanks!
     
  2. 750E-II_29Rbloke

    750E-II_29Rbloke Active Member

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    You need to look a little further with the search engine on this site for some reason (an option to search by thread title would be nice, dunno if it can be done here but iss available on some others...

    http://xjbikes.com/Forums/viewtopic/t=4 ... +sync.html This may be of use?
     
  3. robut

    robut New Member

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    That is a great help, thanks!

    I am very new to this, though. Is there a complete tutorial for tuning carbs from the ground up after a cleaning? I keep seeing terms like "pilot jets" and "mixture screws" and I don't know what those are. I wouldn't want to mess anything up by doing it wrong.
     
  4. 750E-II_29Rbloke

    750E-II_29Rbloke Active Member

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    I think the church of clean thread has the basic post-clean setup info included. The pilot jets aren't part of tuning a stock setup, the only things that are externally adjustable are the idle screw, 3 sync screws & the 4 mixture screws (sometimes referred to as pilot screws/idle screws/air screws or whatever, all the same thing, the fiddly to put back in ones with the spring/washer/o-ring on top of the carbs, the ones where you swear after dropping the o-ring for the 5th time lol)

    If you don't know which ones I mean, then you need to re clean the carbs as the mixture screws must be removed to effectively clean the idle circuit.

    Assuming you have had them out & replaced them in the correct order (take the screw, put spring over it, then washer, then a new o-ring, so that the o-ring ends up in the bottom of the hole with the washer pushing it down) then you need to set them to about 2 3/4-3 turns out as a basic setting
     
  5. robut

    robut New Member

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    Ok, so as long as it's put back together, I should be able to tune everything from the outside? That sounds way easier than what I was expecting. I'll go read the Church of Clean thread right now!
     
  6. 750E-II_29Rbloke

    750E-II_29Rbloke Active Member

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    Yep, all tuning of a stock setup (aside from wet-setting the floats, that takes more effort but I don't class that as tuning, more "repairing" since you only do it once if you do it right) is done with a screwdriver from above the carbs :)

    I just added a bit of other info to my last post by the way...

    More or less everything is in the church of clean anyway, it's a looooong post but worth making sure you go thru it word for word as the carbs are a pain to pull on & off the bike (plus when they're right, the bike runs so sweetly it's more than worth it!) http://xjbikes.com/Forums/viewtopic/t=14692.html
     
  7. robut

    robut New Member

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    Awesome! I glanced through it, and it does indeed seem to have all the info I need. Thanks for the help!
     

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