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Amal Slide Slop?

Discussion in 'Norton Commando Motorcycles (Classic)' started by Tornado, Oct 12, 2019.

  1. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Just wondering, is any amount of play/slop of the Amal slide in the carb bore acceptable or must it be a nice smooth fit?

    What is the going rate for re-sleeving these days?
     
  2. Triton Thrasher

    Triton Thrasher

    Joined:
    Feb 10, 2009
    It’s down to how the bike is running.
     
  3. Craig

    Craig VIP MEMBER

    Joined:
    Dec 20, 2005
    Uh-hum .... get yourself a single Mikuni or try a pair of 32’s ..... then you can worry on other stuff .... have a good Thanksgiving as well !
     
  4. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Been trying to solve a high idle. Slides not hanging, fully closing. I can dial out with mixture screws to around 900 or 1000 ok. But note when blipping throttle it takes a second or so to drop back down to previous rpm. Sometimes I find it creeping up to 11-1200 rpm when sitting at a light. Can't detect leaks at flanges.
     
  5. kommando

    kommando

    Joined:
    May 7, 2005
    Starts with 4 thou clearance, what the wear limit is I don't know.
     
  6. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    I can feel a slight movement on the slide when trying to rock it with my finger. Just don't have any experience with new carbs to gauge this by.
     
  7. Steves

    Steves

    Joined:
    Oct 16, 2016
    What you say indicates (maybe) you have an idle set but the pilot circuit (air screw) is not set correctly. It takes 2 or 3 rotations of setting idle screw then air screw then idle screw.... etc to get the carbs dialled in so the idle (pilot) circuit gives a nice crisp response. If it then acts up off idle with a twist of the wrist adjust needle. Also of course you have to make sure idle circuit is clean and unobstructed, bain of Amal’s!
     
  8. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    What's the mileage ? Usually shot around 10,000. Higher mileages risk fracture of the slide(s) getting slurped into the motor and hopefully spit out the exhaust. Why risk it , start saving for upgrade carb(s).
     
  9. Benton

    Benton

    Joined:
    Dec 17, 2005
    Hello!

    I had the same behaviour with idle being unstable, as you have.
    The source to that was the ignition advance unit.
    On my unit I was able to adjust the tension on the springs to stabilize the idle.

    Benton
     
  10. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    I'm running electronic ignition
     
  11. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Uncertain bike had only 7500 on clock when I got it two yrs ago. But only one carb fitted while other was in box. Did about 3500 on the single last year. Now running both carbs and have swapped in hardened anodized slides.
     
  12. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    Wow I've never seen someone run a single Amal Concentric on a Norton.
     
  13. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Welp someone must have been buying the two into one mani's and single port ham can front plates sold by Norvil/AN/RGM etc which are not directly fittable to Mikuni carbs due to different flange bolt spacing and port sizing.
     
  14. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Just had Mr. Bruce Chessell sleeve my Amals and got them back today:

    IMG_20191203_1345384.jpg

    Slides have notably less slop in the bores. Can't test for quite a while as bike is being readied for winter work.
     
    o0norton0o and illf8ed like this.
  15. MexicoMike

    MexicoMike

    Joined:
    Jan 31, 2010
    Is resleeving all that much cheaper than buying a set of Premiers?
     
  16. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    $150 CDN vs $500 CDN...so I guess it is ;-)
     
  17. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    Bruce did mine too. Great work with dissimilar metals. Brass sleeved slide into bored zinc pot metal body. Rock solid idle.
     
    o0norton0o likes this.
  18. CanukNortonNut

    CanukNortonNut

    Joined:
    Aug 8, 2005
    Good move. Bruce did a number of my carbs. Change out the needle jets because old loose slides will wear these jets oval. Add Stay up floats and aluminum needle valves will make the stars all align.
    Cheers.
     
    Torontonian likes this.
  19. 850commando

    850commando

    Joined:
    Nov 1, 2014
    Tornado; are the throttle cables new? and then how smooth is the twist grip
     
  20. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Cables new. No resistance opening/closing grip against the slide springs. The slides were snapping shut immediately but rpm dropping back to idle still took a second or so.
     

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