675.cc • Triumph 675 Forum

Hole in swing arm on Honda Fireblade

Discussion in 'General' started by Gremlin, Jun 9, 2020.

  1. Gremlin

    Gremlin

    Thread Starter

    493
    28
    28
    Location: Preston
    A mate of mine removed the hugger on his Fireblade to find this hole and is a bit unsure what to do next.

    I said I post on here for him as I'm sure there are a few blade owners on here too.

    It's about the size of a 2p piece and deep as a finger nail, with the lighter material looking and feeling like fibreglass?

    Anyone have any advice for him?

    I think it's a 2015 model with about 10k on the clocks.

    As ever, thanks for any help and advice :)

    IMG-20200607-WA0000.jpg IMG-20200607-WA0001.jpg IMG-20200607-WA0002.jpg
     
  2. Billy1mate

    Billy1mate

    136
    7
    18
    Location: Weymouth
    Oooh, that’s nasty. New swing arm or repair?
     
  3. Gremlin

    Gremlin

    Thread Starter

    493
    28
    28
    Location: Preston
    That's what we're trying to determine.

    Shame as it's a nice bike, with a full Akra system and 175 bhp.
     
  4. towser

    towser

    838
    37
    28
    Location: Torryburn
    I don't profess to be an expert in any way however I wouldn't think thats repairable!
     
  5. D41

    D41

    13,990
    143
    63
    Location: Orange, CA
    I'm almost certain that would be repairable.....a welder, preferably one who knows bikes, will know how to sort that out in no time.
     
  6. Clean it more often? . Sorry not that helpful now
     
  7. StMarks

    StMarks PTG

    12,603
    841
    113
    Location: HU15 2DS
    Considering the stresses that a swing arm is under, fwiw I would be reluctant to use that.
    It appears that the alloy has actually rotted through ? -On a bike that young such deterioration seems rather extreme, and looking at it I can't help wondering if it has been exposed to some sort of corrosive medium to eat through the surface finish & the structure beneath.?
    If ^ that is the case, then presumably the same agent will have entered through there, and may be inside the swing arm doing similar damage unseen elsewhere within.?
     
  8. Billy1mate

    Billy1mate

    136
    7
    18
    Location: Weymouth
    It is cast aluminium and therefore difficult to weld not sure it actually can be welded tbh
     
  9. Billy1mate

    Billy1mate

    136
    7
    18
    Location: Weymouth
    It is difficult from the photos to work out how deep it is, to take that ‘what if’ away id be inclined to find another swing arm and let Honda UK know, I expect it isn’t an isolated incident.

    What I cannot establish is whether there was damage in the paint finish or if it started around the hugger bolt hole and worked it’s way under the paint.
     
  10. Kirklet

    Kirklet

    262
    26
    28
    Location: Hessle
    It’d be inclined to take that off and stick it in the nearest skip ! Swingarms can usually be had for reasonable money if you look around.
     
    • Agree Agree x 1
  11. Looks like galvanic corrosion to me, was there a stainless fixing in there at some point? As soon as you get saltly water added to the mix it'll eat straight through it.

    How deep is it? If it's less than 1-2mm I'd clean it up and repaint and swap the fixings out. Swingarms are stressed but on the blade it'll be stiffness driven rather than stress.

    As long as there are no stress raisers, make sure it's all smooth when you clean it up it'll be ok. If its over 2mm I'd look for a new swingarm as like others have said it's not a bit job to swap.
     
  12. Sorry just had another look at the pictures, looks like it is t a cast section there and possibly aluminium sheet, weld together? If that is the case and it's eaten through the complete sheet bin it and stick another one in.

    I'd be tempted to send some pictures to a local dealer and try his luck for goodwill first though.
     
  13. scaramanga

    scaramanga

    2,598
    175
    63
    Location: whitehaven
    similar to above
    wonder if this is a case of copper slip chemical reaction between 2 metals/alloys
    but what is clear there is some form of corrosion there
     
  14. JohnnyPS4

    JohnnyPS4

    1,309
    315
    83
    Location: Buxton
    I’d say somewhere along the way that hugger brackets taken a whack and caused that hole and the fibreglass type material is the sound deadening that’s exposed, for the price of a replacement and peace of mind I’d buy another and throw that away
     
    • Agree Agree x 1
  15. Gremlin

    Gremlin

    Thread Starter

    493
    28
    28
    Location: Preston
    Thanks for all the input chaps. He's taking the bike to a Honda dealer today.
    He's not keen on fitting a second hand SA and new ones are a grand but if it can't be safely repaired it's the latter I guess.:confused::rolleyes:
     
  16. Kirklet

    Kirklet

    262
    26
    28
    Location: Hessle
    It’s hard to be sure from the photos but is it a 2008-2016 model Fireblade? If so there’s plenty of spare rear swingarms out there going for much cheaper than a grand !
    Just my opinion but spending a grand to replace a part that can be had for a tenth of the price is just madness. Them blades are only worth about 5k upwards now aren’t they?
    Here’s one I saw on eBay, replace or service the bearings and away you go. I must say them standard brake line clips look terrible on some of them, you can see why there could be corrosion problems if neglected.

    https://www.ebay.co.uk/itm/153954562551
     
    • Agree Agree x 2
  17. Gremlin

    Gremlin

    Thread Starter

    493
    28
    28
    Location: Preston
    Cheers, I'll pass this on.
     

Share This Page

Loading...
  1. By using this website you agree to our Cookies usage. We and our partners operate globally and use cookies, including for analytics, personalisation, ads and Newsletters:
    Dismiss Notice