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Kerker exaust, carb setting?

Discussion in 'XJ Modifications' started by snapper33, Oct 17, 2010.

  1. snapper33

    snapper33 Member

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    Thank you up-front for any assistance.

    1982 550 Seca
    6,070 miles

    I have a brand new NOS Kerker 4:1 exhaust. What carb setting works, it seems a little cold-blooded now.
     
    snapper33, Oct 17, 2010
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  2. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Try backing out all 4 mixture screws about 1/8 turn, and then read the plugs.

    6K miles? Did it get its initial valve check at 3000?
     
    bigfitz52, Oct 17, 2010
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  3. snapper33

    snapper33 Member

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    Thank you! I'll try the carb adjustment.

    I'm not sure about the valve check. I just purchased it and the PO put the Kerker on. I better get that done too I guess.
     
    snapper33, Oct 17, 2010
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  4. streetbrawler750

    streetbrawler750 Member

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    If it hesitates when you give it throttle and has a spot under acceleration where it should be going faster than it is try shimming the needles. Also you will probably need to up the main a couple, depending. Do a search on here and there is a lot of info on jetting (some useful... :roll: ) and welcome to the site. :lol:
     
    streetbrawler750, Oct 19, 2010
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  5. snapper33

    snapper33 Member

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    Thanks streetbrawler.

    I wonder if I should put a different exhaust on that doesn't require other adjustments?

    Any opinion on that?
     
    snapper33, Oct 20, 2010
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  6. streetbrawler750

    streetbrawler750 Member

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    Depends on you, if you don't want to mess with anything you could go back to stock. I wouldn't because 4-1 sounds awesome in my opinion.
     
    streetbrawler750, Oct 20, 2010
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  7. iwingameover

    iwingameover Active Member

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    Everything requires adjustments. Some big some small.

    Where are you located? Someone may be close by to help.
     
    iwingameover, Oct 20, 2010
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  8. snapper33

    snapper33 Member

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    I'm in Universal City, Texas, just NE of San Antonio. I've actually put an ad in Craigslist asking for a Yamaha mechanic to come and help. I'm a pretty good MC mechanic, but my other bikes are RDs. 4-strokes are new to me. I'll learn as I go.

    I do love the sound of the Kerker and it's a spanking new NOS pipe, 27 years old....crazy!
     
    snapper33, Oct 20, 2010
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  9. iwingameover

    iwingameover Active Member

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    To start with are your carbs completely clean? You can't tune properly with dirty carbs. Also check the valves. Both should be easy jobs for anyone with mechanical experiance. Plenty of write ups here.
     
    iwingameover, Oct 20, 2010
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  10. snapper33

    snapper33 Member

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    I will be cleaning the carbs very well. It seems a little daunting cracking the stack of carbs and cleaning them. I do not know where to get rebuild kits yet, but hopefully I'll figure that out.

    I have an old aircooled Porsche 911 and I adjust my own valves, pull the engine for clutch work etcetera and work on my 2-stroke RDs and GT so I guess I can tackle this one. I actually bought it to ride and learn 4-strokes...went with a 4-cyl, 'bout as crazy as starting on a CBX, but I'm in the fire now.
     
    snapper33, Oct 20, 2010
    #10
  11. Cmccully04

    Cmccully04 Member

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    everything you will need for the rebuild you can get from the local parts guy Len (chacal) here on the forums. go to the top of the page and click the engine, XJ4ever. you can browse his online catalog or just PM him and tell him what ya need and he will shoot you the info you requested. he is magnificant!!!!!

    *chris
     
    Cmccully04, Oct 20, 2010
    #11
  12. Orange-n-Black

    Orange-n-Black Well-Known Member

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    Welcome to the site and welcome to the fun! :lol:
     
    Orange-n-Black, Oct 20, 2010
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