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08 Norge clunk feeling in fork when compressed

Discussion in 'BNS12 Chat & Tech' started by Dycokac, Jun 29, 2017.

  1. Dycokac

    Dycokac Tuned and Synch'ed

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    So, I've gotten used to the nose dive. But I'll occasionally have this clunking sensation that and to come from the left side maybe more than the right.

    Any suggestion to what that might be?

    Thanks!
     
  2. Oz1200Guzzi

    Oz1200Guzzi High Miler

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    A few things come to mind:
    - Steering head bearings (out there but you never know);
    - Loose caliper (assume while braking);
    - Loose/worn brake pads;
    - Junk on fork sliders (clean fork seals);
    - Fork leg and contents are failing;

    The first 4 are easy to check, the 5th requires major disassembly of the front suspension and maybe a guru to look at it.
     
  3. Dycokac

    Dycokac Tuned and Synch'ed

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    I'll start with that list. It's only got 15k on it, but I'm not the original owner.
     
  4. Android

    Android Cruisin' Guzzisti GT Famiglia

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    I'm watching this one cause I have the same,

    Steering head bearings do need sorting on mine though.
     
  5. Dycokac

    Dycokac Tuned and Synch'ed

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    I have to figure out what I'm checking for, but the bike needs a wash and this is a long weekend so I'm going to see about taking off the front Tupperware. I know there are some loose wires in the fairing... and i have to replace a chrome accent too.
     
  6. brodonn

    brodonn Tuned and Synch'ed GT Famiglia

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    I'm wondering was there a solution found for this? I have what sounds like the same issue, i.e. one clunk when I brake reasonably hard and then a smooth stop. If it was head bearings or wear somewhere I thought it should result in a shudder rather than one clunk. My caliper bolts are tight so I think it could just be the pads moving to take up that fraction of clearance in their space. I imagine I feel it more in my right hand, but I think that's because I.m squeezing on that side. Any further thoughts would be appreciated.
    Brian
     
  7. john zibell

    john zibell Moderator Staff Member GT Famiglia

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    Have you adjusted the preload on the springs? With the bike on the center stand, turn the nuts at the top of the fork all the way in. Then count 7 rotations out. This should get you in the ball bark. If still too soft, go in one rotation at a time. If too stiff, out one rotation at a time. Yes head bearing would give a shudder.
     
  8. brodonn

    brodonn Tuned and Synch'ed GT Famiglia

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    Thanks for the reply John.
    I'm just back from a trip to the pyrenees and I'm happy with my suspension settings, but I still get one clunk from somewhere up front when I initially apply the front brake hard.
    Baffled.

    Brian
     
    NPS likes this.
  9. NPS

    NPS Cruisin' Guzzisti

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    I have a clunk on my B11 when going over a big bump and the suspension is max extension. No idea what it is. Could it be the front suspension hitting max travel?
     
  10. brodonn

    brodonn Tuned and Synch'ed GT Famiglia

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    I'm pretty sure that my clunk happens before my forks would have the time to reach maximum travel, and I don't think they are doing that anyway. I'll do a bit more investigation when I get the chance. I always lightly grease the upper sections of the fork legs to prevent corrosion in that area, so I can see the maximum travel of my forks. I'll let them out fully and compare the distance with the specified max travel of 120 mm. I'm going to get to the bottom of this, pardon the pun.

    Brian
     
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  11. NPS

    NPS Cruisin' Guzzisti

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    I'm aware that the clunk I experience travels as a shock wave and is amplified/heard at the top end area of the folks. Due to the headlamp case that acts like a sound amplifier.
     
  12. NPS

    NPS Cruisin' Guzzisti

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    I went over some rough ground and clunk clunk... I had a guess the mudguard was amplifying the sound of the wheel over the rough ground. I removed the mudguard and made up some fibre glass strips and resin. Coated in a single coat the inside surface of the mudguard to test. Resin went off and hardened. Reinstalled and test ride. The clonk was reduced and only apparent on the deepest of ruts/holes. The extra fibre glass strips in resin bonded inside the mudguard has reduced the vibration/amplification of the mudguard. More adjustment possible at low cost and within tyre guard distance.

    But Is the clunk caused by something else regarding the function of the fork and damper. Further investigation required.
     

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