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Fast Idleing / Hunting

Discussion in 'Norton Motorcycles (Modern)' started by Kiwi961, Oct 13, 2017.

  1. Kiwi961

    Kiwi961

    Joined:
    Nov 22, 2016
    Hi All,
    I have just been for a spin after completing all the upgrades suggested by Richard and replaced the sensors with genuine Bosch. The bike runs great and although it stated from cold with an idle at 1400 it dropped back to 1200 once warmed up. When I stopped at the alights after about 20 minutes riding it was 'hunting' between 12 - 1800 revs. I turned it off and waited a bit and when I restarted it was idling nicely at 1200, but at the next set of lights it was hunting again.
    Any thoughts anyone?

    Cheers

    Paul
     
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  2. richard-7

    richard-7

    Joined:
    Feb 24, 2014
    I would suggest its your idle screw. I have a manual on how to adjust it. Let me know how it works out.
     
  3. Kiwi961

    Kiwi961

    Joined:
    Nov 22, 2016
    IMG_1655.JPG Hi Richard,
    Yes I'd checked that, its actually backed right off from where it was. I'll try resetting it but it was doing it at the original setting where it was idling nicely before I added all the new bits, and still doing it with it backed right off.
    Also check out the colour of the new plugs after about half an hours ride - black as...
     
  4. richard-7

    richard-7

    Joined:
    Feb 24, 2014
    Thats black alright.
    Look around for a vacuum leak.

    Make sure you add the set screw jam nut.

    When its running, see if both exhausts are same temperature.

    Sounds hard to believe but swap spark plugs and see if the black problem moves to the other cylinder. Maybe the spark plug or wires aren’t connected tight enough.
     
  5. Britfan60

    Britfan60 VIP MEMBER

    Joined:
    Jan 5, 2014
    I rode a few days with the Bosch coil and the one07 wires and the bike was absolutely flawless. Added the Iridium plugs and she idles at 1600 after a 30 mile ride at about 70mph. Probably something else. Just find that a little odd. I was also thinking of screwing with the idle screw, but it idles at 1250 after a restart. I haven't pulled a plug yet. Other than that, riding has been great.
     
  6. LEXngton

    LEXngton

    Joined:
    Jul 21, 2017
    From 1st ride of my 2016 Sport MKII I had idle issues but only when the engine got very hot, after long riding. I would pull up to a stoplight/sign and it would always start cycle idling from around 1600rpm-2200 rpm, again this only occurred when the bikes engine was very hot. When engine was just started and/or only warm its idle was around 1100-1200 rpm & constant so normal.

    BTW I changed all 3 sensors, installed racing plug wires & Iridium plugs, a new Bosch Coil, Transmission Vent, none of which made any difference in regards to the faulty idling.

    Fast forward, the bike gets DE-Cat pipes & Long Open exhausts along with a new MAP. Since the first start after installation of the new MAP the bike is 100% normal now in its idling, be it cold, warm, or very hot.

    So imo my factory MAP was in some way faulty and installation of a new one instantly corrected the idling issues, thank goodness. Was quite embarrassing pulling up to a stoplight on such a awesome bike while it cycled through its fast idling and it wasn't great for the bikes mechanics either.
     
    contours and richard-7 like this.
  7. trevorpacker

    trevorpacker

    Joined:
    Jul 14, 2012
    Had a similar problem, but only one plug running black. Was caused by faulty oxygen(Lambda sensor)
     
  8. Raphi

    Raphi

    Joined:
    Aug 17, 2015
    I had once similar symptoms at my CR 961. The mechanic found something at the throttle sensor, I think, but I am not 100% sure if it was this... As it came back some time later I just adjusted the idling at a bit lower rpm. Not much but this helped, never happened again and this for some thousand miles now.
     
  9. Kiwi961

    Kiwi961

    Joined:
    Nov 22, 2016
    Both plugs are black / carboned up. So we're the ones I took out before upgrading everything. Wondering if it's a map issue, or just not breathing right?
     
  10. richard-7

    richard-7

    Joined:
    Feb 24, 2014
    Or your rings are lined up on both pistons. Its sort of a common issue for what you’re experiencing in all sorts of vehicles not Norton specific. Last resort you could pull the heads. I have a manual for that. You’ll need ONE07 gear and clutch JAM and gear puller and cam lock tool to do it.
     
  11. Raphi

    Raphi

    Joined:
    Aug 17, 2015
    As I was instructed, you should shut down the engine after a longer ride (hot engine) at riding rpm e.g. around 4000 rpm. Turn the key off before engine goes back to idling rpm. It is possible that in idling you have much richer mix than at riding rpm and you see the wrong face of the plugs... Just a guess.
     
    contours likes this.
  12. Raphi

    Raphi

    Joined:
    Aug 17, 2015
    What type of plugs are you using?
    I have installed CR7EIX...
     
  13. Kiwi961

    Kiwi961

    Joined:
    Nov 22, 2016
    Hi Raphi,
    Yip - same here
     
  14. Kiwi961

    Kiwi961

    Joined:
    Nov 22, 2016
    Fixed it! I went right back through all the changes I had made and reversed them to check that I hadn't installed a faulty sensor or other part but no change. Then I took Pingu's advice and disconnected the O2 sensors and it fixed it immediately for the cost of 2 80 cent resistors. If you want to see how smooth your bike can be I recommend it. Very easy when cruising around town and pulls away from 2500 revs in top gear with no jitters.
    So now the bike has had the following changes:
    107 coil
    107 leads
    Irridium plugs (gapped at 30 thou)
    Bosch sensors
    Opened up air box (90mm inlet)
    Dominator map.

    It's running really well and has heaps of low down torque which makes it so much nicer to ride.
     
    pingu-nz and richard-7 like this.
  15. richard-7

    richard-7

    Joined:
    Feb 24, 2014

    To be clear, you’re using resistors to bypass the o2’s??
     
    pingu-nz likes this.
  16. Kiwi961

    Kiwi961

    Joined:
    Nov 22, 2016
    Yes.
     
    pingu-nz likes this.
  17. pingu-nz

    pingu-nz

    Joined:
    Jun 24, 2011
    Richard
    Both my tiger 1050 and Norton have oxygen sensors disabled and 330 ohm resistors installed.
    This stops the check engine light comming on and smooths out the fueling around town at lower revs.
    You can buy a fancy $30 plug to install or a 30 cent resistor from jacar .
    Cheers
    Paul
     
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  18. richard-7

    richard-7

    Joined:
    Feb 24, 2014
    Great info. Thanks for sharing.
     
  19. TonyA

    TonyA VIP MEMBER

    Joined:
    Jan 16, 2015
    Hello pingu-nz , Aren't you also running the Dyno Jet Power Commander ? I thought that the resistors replacing the o2 sensors were a normal step in power commander installation. ?
     
  20. TonyA

    TonyA VIP MEMBER

    Joined:
    Jan 16, 2015
    There was a forum member that had posted a link to the site that sells the resistor plug adapters. Could they post this again ?
     
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