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Where does the noise come from?

Discussion in 'Norton Motorcycles (Modern)' started by lcrken, Feb 5, 2018.

  1. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    Just curious about the source of the threshing machine noise from the engine. I was warned to expect it before I bought the bike, so I'm not complaining. But I do wonder if anyone knows what causes it. It sounds to me like it's coming from the primary, so I'm guessing it's just a result of the gear drive system. From the pictures, it doesn't look like they used a split gear to take up backlash, although I can't tell for sure. Straight cut gears are notorious for this sort of noise. Anyone got any more info on this subject?

    Ken
     
  2. BritTwit

    BritTwit

    Joined:
    Aug 25, 2009
    Ken,

    I believe the balancer shaft gear is a backlash gear.
    But the engine does make quite a bit of mechanical noise.
    Best to have an even louder exhaust system.
     
    gchoppin and richard-7 like this.
  3. BPHORSEGUY

    BPHORSEGUY

    Joined:
    Nov 29, 2013
    BritTwit is right, just upgrade the exhaust and you won't think about it again!
     
    rod frost and contours like this.
  4. pantah_good

    pantah_good VIP MEMBER

    Joined:
    Jul 17, 2015
    That fix always worked good for Ducati dry clutches.
     
  5. richard-7

    richard-7

    Joined:
    Feb 24, 2014
    As BritTwit said. Balance shaft gear is main culprit. It can be fixed tho. We have a tension setting tool to make it easier and perfect. But be careful its very easy to over tension which is mostly the case in pre 2015 models. The assembly team have gotten better thats for sure. Also straight cut gears and timing chain could be a little loose.
     
  6. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    Thanks for the replies. I don't think it's the timing chain. I've heard that before on old Commandos, and this doesn't sound the same. But I could be wrong. Besides, it really does seem to be coming from the primary side. I'll try to do a little sound probing to see if I can localize it a little better.

    The bike came with the SB pipes, so I really only hear the noise at low speed and idle. It really doesn't bother me much. I fired it up next to one of my friends yesterday, who is serious Harley guy, and he was really freaked out by it. He was positive it was about to explode. Almost worth it just for that.:)

    Richard, is that tool available from CNW?

    Ken
     
  7. richard-7

    richard-7

    Joined:
    Feb 24, 2014
    Tool is available from CNW. You’re going to need to get a new spring from NORTON. Be extremely careful not to over stretch the new spring at install. Practice with the old one a few times first. You’re also going to want the GEAR JAM tool. All info is in my manuals.

    There is one more item to note. This really was an issue on 2013 and some 2014 bikes and we stressed to factory and they fixed for sure by 2015 but the ring gears come loose and shear off the bolts. This is the gear attached to the clutch basket. In Canada we started to PIN (drill and dowel) the ring gear to the basket. My dads 2013 SE had his ring grear break off at a traffic light. I was next to him. He thought his bike was getting louder and sure enough. Thankfully a block from home. I made a post about it. I’ll try to find it and bump it.
     
  8. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    I'll check the ring gear, and add the dowels. I need to order some other stuff from CNW, so I'll pick up the tools at the same time.

    Ken
     
    richard-7 likes this.
  9. hywayman

    hywayman

    Joined:
    Jun 24, 2018
    g'day Richard, a customer of mine has a 2016 961CR with the balancer / clutch issue & only done 1,200 klms!
    does anyone in Australia stock your tools?
    thanks
     
  10. richard-7

    richard-7

    Joined:
    Feb 24, 2014
    COLORADO NORTON WORKS ships world wide. Hope this helps some.

    Richard
     
  11. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Actually, solving the mechanical noise issue is quite easy...

    Just get a mate to buy a dry clutch Ducati and accompany you on every ride, the 961 will sound as sweet as a nut !!
     
    contours and Raphi like this.
  12. hywayman

    hywayman

    Joined:
    Jun 24, 2018
    I have received a replacement clutch basket, hub & balancer gear today.
    started putting it all back together after several weeks.....
    can anyone advise on the balancer gear & clutch hub nuts, these are the same but i only have 1 thick hardened washer
    photos taken on tear down show 1 on the balancer gear
    is the clutch hub meant to have the same washer?
    thanks in advance
     
  13. richard-7

    richard-7

    Joined:
    Feb 24, 2014
    I have a manual on this.
     
  14. hywayman

    hywayman

    Joined:
    Jun 24, 2018
    g'day Richard, i have looked at your manual but i can't make out clearly in the photos if both the split balance gear & the clutch hub, both should have the thick hardened washer. i'm now assuming this bike has been assembled without the clutch nut washer!
     
  15. TonyA

    TonyA VIP MEMBER

    Joined:
    Jan 16, 2015
    Clutch Hub does NOT have the washer. If we ask Rob Jameson to be sure would be best.
     
  16. Rob Jameson - Norton UK

    Rob Jameson - Norton UK

    Joined:
    Apr 9, 2018
    Correct, no washer on the clutch centre nut - only on the balancer/backlash.
     
  17. Britfan60

    Britfan60 VIP MEMBER

    Joined:
    Jan 5, 2014
    Mine backed off until the whole basket was loose. Worth having a look see before damage is done.