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Carb openings

Discussion in 'XJ Technical Chat' started by Stoopkid22, Jan 20, 2015.

  1. Stoopkid22

    Stoopkid22 Member

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    im looking to put pod air filters on my xj550 and remove the air box. I'm measuring the outside diameter of the carb at 50 mm but everything I see online is saying they are 54 mm. Can someone tell me which one is correct?
     
    Stoopkid22, Jan 20, 2015
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  2. a100man

    a100man Well-Known Member

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    50mm sound more like it, my BS32s (off xj600) are 'only' 53mm - I just measured for curiosity. So the BS28s will be smaller
    than that.
     
    a100man, Jan 20, 2015
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  3. Stoopkid22

    Stoopkid22 Member

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    Thanks man I appreciate it
     
    Stoopkid22, Jan 20, 2015
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  4. k-moe

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

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    I would like to apologise in advance for all the trouble you are about to deal with. Sometimes stock is better.
     
    k-moe, Jan 20, 2015
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  5. FtUp

    FtUp Well-Known Member

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    I would have to agree, this stock xj550 seca I am riding is a bullet! I couldn't imagine messing it up with pods and aftermarket or chopped up exhaust. don't forget folks, there is a direct relationship between the intake and exhaust. the engineers that built them know way more about it and have done their math.

    FU
     
    Last edited: Mar 1, 2015
    FtUp, Jan 20, 2015
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  6. Xjrider92117

    Xjrider92117 Active Member

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    I just measured the inside diameter of the carb holder (air box side) and its 50mm. It's a old carb holder so don't take my word for sure. But that's what I got. It's your bike do what you want to it. I would save all original parts just in case....
     
    Xjrider92117, Jan 20, 2015
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  7. Stoopkid22

    Stoopkid22 Member

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    I know it's not gonna run like a stock but it's my first build and I'm using it as a learning experience. I've already learned a lot but I've got much much much more to learn.
     
    Stoopkid22, Jan 20, 2015
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  8. k-moe

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

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    Just take care to not do anything that can't be undone. The 550 is well on its way to being collectable.
     
    k-moe, Jan 20, 2015
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  9. jayrodoh

    jayrodoh YimYam

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    Ditto. I was young once and thought pods, hollowed out mufflers, straight pipes, drilled jets, etc. would be awesome. Now I pass over bikes that are modified and hacked, and spend lots of time looking for original parts on my project bikes. Here is an old article from a Mikuni engineer, its good read for anyone that is thinking about some mods.

    I had the fortune of picking up a running 1975 Z1 900 super cheap when I was younger, that unfortunately was my "learning" bike. Put pods and pipes on it. I'll bet money that my KZ750 will waste that bike now the way I had it set up. Sure looked purty though.
     

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    jayrodoh, Jan 20, 2015
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    FtUp likes this.
  10. Stoopkid22

    Stoopkid22 Member

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    Well I'm waaaaaay past stock anyways. I hardtailed it and I'm getting it back together now. I wish you guys could have seen this thing before I started with it.....the whole ass end was trash. Frame was rusted and everything. Here's the latest picture I've got of it
     

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    Stoopkid22, Jan 20, 2015
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  11. jayrodoh

    jayrodoh YimYam

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    Just realized I also posted on your hardtail/bobber thread. Looking good and yeah, that's not going back to stock easily. There are people that have gotten satisfactory results with modified intake exhaust sets. Barebones rides did a really nice XJ650 bobber. The guys there are super friendly, I was emailing back and forth with them for awhile on a project.

    If you need help on the jetting/tuning, they work with another company (names escapes me right now) that can make you a custom jet set for the carb based on your intake, exhaust, and engine mods. Comes with detailed instructions too. Shoot them a message if you're interested and they'll hook you up.

    http://www.barebonerides.com/connect-wbbr.html
     
    jayrodoh, Jan 21, 2015
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  12. kwes

    kwes Member

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    BareBonesRides does some sick work.
     
    kwes, Jan 22, 2015
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  13. k-moe

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

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    Frames are easier than engines. IF you really want that look then go for the pods, but you will be making a trade-off. Poke around here and you will find a thread about tuning with pods, and a few threads where people have made alternative airboxes. Some of them work better than pods, and look pretty good.
     
    k-moe, Jan 23, 2015
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  14. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    If you're not going to use the airbox, I'd be interested in it if you pull it out unmolested.

    Dave
     
    hogfiddles, Jan 24, 2015
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