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Dry metal sound from front wheel

Discussion in 'Technical and Troubleshooting Torque' started by C15CO, May 8, 2012.

  1.  
    C15CO

    C15CO Member

    Joined:
    Feb 20, 2012
    Messages:
    40
    Motorbike(s):
    2001 Honda NSR 150 SP
    Hi,

    Just got my bike back on the road after having to rebuild the engine and i'm not sure if this is due to it sitting still for two months but now there is a dry metallic sound coming from the front end.

    The sound is constantly there regardless of breaking or acceleration but does increase in volume with speed.

    Do I need a new front bearing?

    Is it dangerous to ride? After the rear wheel lock up, i'm not keen to try a front wheel.



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  3.  
    Whiteyy
    Spaced

    Whiteyy Premium Member

    Joined:
    Jan 20, 2009
    Messages:
    646
    Location:
    Melbourne
    Motorbike(s):
    1989 VFR400R
    Pads worn?
  4.  
    C15CO

    C15CO Member

    Joined:
    Feb 20, 2012
    Messages:
    40
    Motorbike(s):
    2001 Honda NSR 150 SP
    I had ruled this out as the sound is present even when I'm not breaking (is this wrong).

    I have about 5mm of pads left
  5.  
    hornet
    Cheerful

    hornet Moderate Moderator Moderator

    Joined:
    Mar 13, 2005
    Messages:
    25,797
    Location:
    Wollongong
    Motorbike(s):
    1995 Honda VFR750
    sounds suspiciously like front wheel bearings to me....
    • Like Like x 1
  6.  
    C15CO

    C15CO Member

    Joined:
    Feb 20, 2012
    Messages:
    40
    Motorbike(s):
    2001 Honda NSR 150 SP
    Is this dangerous
  7.  
    hornet
    Cheerful

    hornet Moderate Moderator Moderator

    Joined:
    Mar 13, 2005
    Messages:
    25,797
    Location:
    Wollongong
    Motorbike(s):
    1995 Honda VFR750
    If you keep riding with it like that; if the bearing collapses altogether it can then rip the metal out of your front wheel and cause the bike to become unstable.

    So, here's what to do.

    Assuming the CB400 has a centre-stand, get it up on the stand.

    Don't start the engine

    get someone to apply his weight to the back of the seat and lift the front wheel off the ground, spin the wheel with your hand and get your head down near the front axle and listen.

    If the grinding noise comes from there, go to your mechanic...
  8.  
    GreyBM

    GreyBM Premium Member

    Joined:
    Aug 2, 2007
    Messages:
    5,913
    Location:
    Altona North
    Motorbike(s):
    BMW R1150RS; Yamaha XJ600
    Pads can rub gently on the disk and make a grating sort of noise even when not braking. In fact normally I would expect it to go away as you applied brakes and the pads engage properly.

    Sounds like wheel bearing but I would certainly check pads first to eliminate them.
  9.  
    AzzA68

    AzzA68 Member

    Joined:
    Mar 18, 2012
    Messages:
    117
    Location:
    Biddelonia
    Motorbike(s):
    Stable fulla Fastuns
    Excessive heat in the disk will occur when pads are rubbing. Also make sure the calliper isn't rubbing on the disk; that definitely sounds like a "dry metal sound", my dealers mechanic sent me away from the shop with that happening after a tyre change... I change my own tyres nowadays.
  10.  
    C15CO

    C15CO Member

    Joined:
    Feb 20, 2012
    Messages:
    40
    Motorbike(s):
    2001 Honda NSR 150 SP
    Thanks for the advice guys. I'll keep her off the road until I check if it's the pads or bearings
  11.  
    ibast
    Horny

    ibast Shit Stirer Premium Member

    Joined:
    Nov 16, 2004
    Messages:
    9,309
    Location:
    Kuala Lumpur
    Motorbike(s):
    Triumph Daytona 955i, KZ400 project
    I'm with Hornet on this one. The other thing is the speedo drive (if it is driven off the front wheel).

    continuing to ride with either of these damaged will to expensive damage to other bits.

    Bearing replacement is fairly easy and the bearings are cheap parts.
  12.  
    C15CO

    C15CO Member

    Joined:
    Feb 20, 2012
    Messages:
    40
    Motorbike(s):
    2001 Honda NSR 150 SP
    Oh, maybe it is the speedo (it is driven off the front wheel). I got the bike a few months ago, and the speedo has always been out by 20kms

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