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82’ XJ750, air box removal

Discussion in 'XJ Modifications' started by Mike66, Apr 16, 2018.

  1. Mike66

    Mike66 New Member

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    I was told that if you want to remove the original air box and instal individual cone/pod filters, I’ll need to rejet the carbs. How do I go about this, what do I need to order? Any and all recommendations are appreciated.
     
  2. Chitwood

    Chitwood Active Member

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    There is no magic formula for this. Biggest advice I can offer is to remove the airbox without damaging it so you can put it back in when you've had enough of taking the carbs on and off the bike, flat spots in the power band, etc. Go to xj4ever website and read through the fuel system thread. It will give you a rough idea of where to start. Good luck to you. I know there's others that have done it successfully but even they will tell you it didn't come easily.
     
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  3. XJ550H

    XJ550H Well-Known Member Premium Member

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    recommendation
    1 dont do it remain stock bike will run much better
    2 buy slide carbs $1500 if you want to run pods
    3 do not destroy the air box when removing you will need to remove carbs starter undo front motor mounts and a little heat on plastic helps get it out
    4 save air box for future reinstall.
    5 do not buy cheap $20 pods get the k&n pods $$$

    so the first thing you want to do is get the bike in proper running order valve shim check, full rebuild of carbs replace all o rings throttle shaft seals and complete cleaning of all passages and jets, sync carbs and adjust mixture screws. this is so you do not chase your tail when you go pods.

    in this link you will find an explanation of how to rejet based on your changes. that will put you at a good place to start with the jets
    The Information Overload Hour

    this link is how to complete the carb tuning process
    http://www.factorypro.com/tech_tuning_procedures/tuning_carbtune,CV,high_rpm_engines.html

    there are carb kits for pods who offer tech support
     
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  4. Minimutly

    Minimutly Active Member

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    One simple suggestion from me would be to invest in decent (not cheap chinese) filters, make sure there is, or you can form, a decent radius, on the inside edge. Then go to a reputable dyno centre to set the jetting. Should cost a couple of hundred dollars plus the filters themselves.
    Cheaper than a set of flatslides, which btw you will also need to set up on the dyno.
    Do not try to do this yourself without sufficient knowledge and at least a wideband lambda exhaust centre.
    It's doable, just not easy or especially cheap.
     
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  5. sybe

    sybe Active Member

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    I run pods with a jet kit. Its not easy. There is a lot of tinkering and tweaking needle shims, jets, air flow, and fuel levels. What works perfect today, will give you a different result tomorrow. Nothing major, but you can feel it.

    If you like to tinker like me, then go for it. Be prepared for the amount of labor involved. If you want easy and to just ride keep the airbox.

    Slide carbs are great but they have their own faults. If you want to run pods still great... read up on it, check out other sites and invest in filter wraps. Filter wraps go over the pods to help filter out debri amd water when it rains. Outterwear is one manufacturer.

    And you dont need a dyno to tune a carb
    .. unless you want to race on a track, if thats your plan buy a different bike.
     
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  6. Minimutly

    Minimutly Active Member

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    You might not need a dyno sybe, but if you don't have the equipment or knowhow, how else would you know if you're rich or lean? Yes I know, multiple plug cuts, but how long will that take someone with no experience?
    (By suggesting a dyno centre I assume they would have the means for this).
     
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  7. Jetfixer

    Jetfixer Well-Known Member

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    Don't do it The carbs are CV carbs they do not like velocity change which PODS induce , if you insist that is path you want to go down , be aware that you need to fabricate some type of bracket to support the back of the carbs .....DO NOT rely on the boots alone with stock carbs and airbox both ends are supported . Without it the carb boots can crack from the weight of the carbs .
     
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  8. Andyam5

    Andyam5 Member

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    Don't
     
  9. Mike66

    Mike66 New Member

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    Thanks for all the advice. Wow! A bit overwhelmed with the path ahead of me.
    Just about every bobber project I’ve seen online has pods, some sound great while others don’t. I’ll give it a shot and save the air box as well.
     
  10. metricman820

    metricman820 New Member Premium Member

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    I restored my XJ750 Seca last year and have pods, only had to tinker a little with the Dyno jet kit but since then have had no issues and the bike starts and runs just like it came off the show room floor. Defiantly use K&N pods and covers and a Dyno jet kit.
     
  11. k-moe

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

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    For reference, did you ever ride an XJ750 in stock condition?
     
  12. Jetfixer

    Jetfixer Well-Known Member

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    I was coming home yesterday a guy was on an 82 maxim with pods and no mufflers it was popping and spitting at idle and when he took off it bogged before picking up ....funny I do NOT have any of the issues like this but guess my bike does not look as cool as pods ( sarcasm)
     

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  13. Minimutly

    Minimutly Active Member

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    No, it doesn't....
    But of course, bueaty is in the eye etc.
     
  14. metricman820

    metricman820 New Member Premium Member

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    Unfortunately I haven't ridden an XJ750 with the stock air box, When I picked up the 2 bikes to make this one neither had the stock air box. But I did restore an 82 XJ650 Maxim with stock air box and exhaust. I will still say my 750 with pods starts easier and runs smoother.
     

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