four hundred four forks

Discussion in 'Classic Motorbikes' started by mark, Mar 28, 2009.

  1. mark

    mark Guest

    The new forks are as lovely inside as they outside.
    I dismantled the old ones today (with the aid of a broom handle at one
    point) and discovered a possible explanation for the strange weaviness.
    The leaky fork had nice new fork oil (understandably I guess), while
    the other soundly sealed fork had some coal in it.
    Anyway the new forks(well one, still got to dismantle the other) were
    absolutely identical; even the holes in the damping rods were the same.
    Not sure about the springs themselves but they certainly felt similar
    while pumping the old oil out.
    Is there anything arcane about damping bits that I should look for?
    I'm awaiting some proper Honda 10w oil and it can all go back together

    P.S. Any tips on removing fork seals that have had 30 years of settling
    in? I'm scared of using the blow torch on the other new forks well.
    mark, Mar 28, 2009
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  2. Wrap rags round the leg, where the seals sit, and pour boiling water on
    the rags to heat up the leg and seals.

    That makes removal (and installation) easier.
    The Older Gentleman, Mar 29, 2009
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  3. mark

    mark Guest

    Finished them today and just tried 'em out :)
    After careful study the only part that is listed as different is the
    'comp (ression?).tube'
    So I swapped these items from the old forks and it all seems to be fine.
    Fitted dust seals instead of gaiters also.
    I had some fun with the brake caliper, had to take the pads out and
    clean the gap between the floating pad and the caliper.
    I think the caliper would benfti form a genral overhaul methinks.
    Much better but the strange weave remains :(
    Swing arm bushes?
    mark, Apr 12, 2009
  4. Hm. Generally, they don't weave. It could be tyres - like a lot of old
    Honda fours, they benefit from a ribbed front tyre.

    Could be s/a bushes, head races, tyres, or a combination of each and
    The Older Gentleman, Apr 12, 2009
  5. mark

    mark Guest

    Begins to count washers.......................
    mark, Apr 12, 2009
  6. mark

    mark Guest

    Straight out after breakfast for a spot of road testing :D
    How much fun?!
    Anyway its running metzelers me22 which are definitely not ribbed on the
    The swing arm bushes seem OK to feel.
    But the forks are not in line. Sighting from the side you can see that
    they don't line up. Had a go at slackening everything off and lining
    them up but I suspect the bottom yoke is bent :(
    The clamps on the top yoke are a tiny bit twisted also.
    So it goes on.....

    But how much fun to ride..... :D
    mark, Apr 13, 2009
  7. Wonder if it's had a mild front-end shunt? Were the old forks straight?
    Austin Shackles, Apr 14, 2009
  8. mark

    mark Guest

    Yup. There are a few scratches which might indicate a tumble on the
    clocks and front guard too. Bars are straight. I guess I better check
    the frame now.
    I had assumed that a frame bending do would destroy the front wheel and
    mud guard.
    mark, Apr 14, 2009
  9. might just be the yokes, if yer lucky. If the forks aren't aligned with
    eachother, it's likely to be yokes, in fact. If they're not aligned with
    the frame, it could be the frame.

    I'm assuming that you're tightening everything in the right order, to get
    the forks aligned :)

    Another possibility is that it was shunted, forks were a bit bent and were
    swapped for a S/H pair.
    Austin Shackles, Apr 14, 2009
  10. mark

    M J Carley Guest

    <coughs> Make sure you've cleared any powder coating residue from
    inside the headstock before you try to put the shells in.
    M J Carley, Apr 15, 2009
  11. And use paraffin for this task?
    [email protected], Apr 15, 2009
  12. mark

    M J Carley Guest

    And a blow torch. Burning the powder out should work nicely.
    M J Carley, Apr 15, 2009
  13. mark

    Rusty_Hinge Guest

    Rusty_Hinge, Apr 15, 2009
  14. mark

    mark Guest

    Thank you all :)

    /feels spoilt...
    mark, Apr 15, 2009
  15. Using the patented Mavis Beacon "Hunt&Peck" Technique, M J Carley
    You sod! You denied that when it was touted as a possibility.

    Wicked Uncle Nigel - "He's hopeless, but he's honest"

    I have already made the greatest contribution to the fight against climate
    change that I can make: I have decided not to breed. Now quit bugging me and
    go and talk to the Catholics.
    Wicked Uncle Nigel, Apr 15, 2009
  16. mark

    platypus Guest

    You'll believe a man can lie...
    platypus, Apr 16, 2009
  17. mark

    M J Carley Guest

    In fairness, at the time, I had no way of checking. I can only assume
    that was the reason, or the shell being a very tight fit. In the end,
    the new one went in okay with the aid of a freezer and hot rags.
    M J Carley, Apr 16, 2009
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