Announcement

Collapse
No announcement yet.

Carbtune results at different RPM

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
  • #1

    Carbtune results at different RPM

    Trying to decide what RPM to use the carbtune at; If I have the engine at 1100 RPM and balance them level it changes as I increase RPMs. If I set them level at 1100 RPM they become asymmetric till 3K or so and then are level.

    If I set them level at 2K RPM where it's closer to where I'm usually riding at in average around town traffic, they are way off when back down at idle.

    However, If I set them level at 2K, they stay level up to the upper RPMs

    Seems like I should set them at 2K, closer to where the bike is running when in operation, the only time the bike is at 1100 RPM is when I'm not moving and I don't keep it there for long with the engine running.

    Thoughts on this?
    Last edited by KA1J; 06-28-2012, 11:43 AM.
    82 XJ1100 Maxim "hurricane"- DEKA EXT18L AGM battery , NGK BPR6EIX spark plugs, Green Dyna coils, Sylvania SilverStar Ultra H4 bulb, 139 dB Stebel Nautilus air horn, Home-made K&N air filter based on an original paper filter frame, new piston rings, Barnett Clutch Springs, SS braid/Teflon brake lines, TKAT fork brace, rebuilt calipers, master cylinders, new brakes, reupholstered seat, lotsa little things and so many answered questions here.
    Tags: None
  • #2
    I'm assuming that those rpms you checked at are all with the bike stationary. (ie. not on the road and definitely not under load)
    Under load (bike going down the road), the whole thing is completely different.
    (more suction, throttle open more, thus more fuel flow, etc.)
    I kinda do agree that you'd want the butterflies/carbs to be sync'd in the normal operating band (ie 2-3krpm while riding), but however, actually dialing these in may be difficult if not impossible.

    Any other ideas from the super gurus?
    Hi, my name is George & I'm a twisty addict!

    80G (Green paint(PO idea))
    The Green Monster
    K&N A/F, TC's fuse block, '81 oil cooler, TC's homemade 4-2 w/Mac Mufflers, Raptor 660 ACCT
    Got him in '04.
    bald tire & borrowing parts

    80SG (Black w/red emblems & calipers)
    Scarlet
    K&N A/F, TC's fuse block, WJ5, Shoei bags, Raptor 660 ACCT.
    Got her in '11
    Ready for the twisties!

    81H (previously CPMaynard's)
    Hugo
    Full Venturer, Indigo Blue with B/W painted tank.
    Cold weather ride

    Comment

    • #3
      The carbtune should only be used at or below normal idle speed. It is not designed to be used to adjust anything at speeds higher than that. Also, since you have an XJ, you'll need the YICS eliminator tool to get a real reading from it.
      1980 XS850SG - Sold
      1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
      Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
      Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

      Whether you think you can, or you think you cannot - You're right.
      -H. Ford

      Comment

      • #4
        Thanks!

        I have the YICS eliminator in 24/7 so that's covered.
        82 XJ1100 Maxim "hurricane"- DEKA EXT18L AGM battery , NGK BPR6EIX spark plugs, Green Dyna coils, Sylvania SilverStar Ultra H4 bulb, 139 dB Stebel Nautilus air horn, Home-made K&N air filter based on an original paper filter frame, new piston rings, Barnett Clutch Springs, SS braid/Teflon brake lines, TKAT fork brace, rebuilt calipers, master cylinders, new brakes, reupholstered seat, lotsa little things and so many answered questions here.

        Comment

        Previous template Next
        Working...
        X