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fitting new Falcon alloy rear shocks

Discussion in 'Norton Commando Motorcycles (Classic)' started by SteveBorland, Mar 22, 2019.

  1. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Yes, Maxton’s are MUCH slimmer in that area.
     
  2. Dommie Nator

    Dommie Nator VIP MEMBER

    Joined:
    Apr 2, 2013
    Nigel, did you sell the Falcons?
     
  3. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    Chrome pipes on a race bike means you are more interested in show than go.
     
  4. Fast Eddie

    Fast Eddie VIP MEMBER

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    Oct 4, 2013
    Yessir.
     
    Dommie Nator likes this.
  5. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    Might have been because chrome adds weight. But the later Gileras had chromed pipes. It's strange what you think is important when you are very young. I was only 14. The thing that struck me the most were my watering eyes when I was standing behind the dummy grid which was full of bikes with their motors running. Most had megaphones and they were burning methanol, probably too rich. The air was full of acid. That was in 1954. I didn't go to race meetings regularly until 1958, then I was always there. At the 1954 meeting, I remember Duke taking long sweeps right past the leaders and into the corners. Fisherman's Bend was pretty fast, but Duke made it look easy. My uncle's friend who rode a 7R, almost fell off in fright when Duke passed him at Bandiana race circuit. In those days, most race bikes weren't so fast, but speed in races is always relative.
     
  6. Dellis

    Dellis VIP MEMBER

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    Jul 22, 2018
    744DE5E2-FCC8-4708-B800-7E3586E26341.jpeg
    I fitted a pair last year with no clearance issues and a standard chainguard as can be seen in the pic.

    Dave
     
  7. SteveBorland

    SteveBorland

    Joined:
    Nov 15, 2010
    Mmm, interesting that...
    I'm hoping to be able to get some time in the workshop this week - did not happen last week though, hence the lack of the promised photos.
     
  8. Dellis

    Dellis VIP MEMBER

    Joined:
    Jul 22, 2018
    Steve,

    Just found the update I wrote up after initial fitting

    "Fitted the Falcons today and the spring rate is bang on for my 15st - 110 lb/inch springs give me 4mm static sag and 19mm dynamic sag after adjustment, Robin recommends 25% dynamic sag which is 19mm of the 76mm travel. No issues with the standard chain guard they even clear with the adjusters right at the bottom of threads."

    Dave
     
  9. Onder

    Onder

    Joined:
    May 11, 2010
    Looking for new shocks and noticed that Ikon seems to offer shocks that fit the Norton...take a look at the long length of the bottoms.
    Terribly pricey compared to a standard Ikon though.
    https://ikonshocks.co.uk/shop/7610-1653-sp9/
     
  10. elefantrider

    elefantrider VIP MEMBER

    Joined:
    Apr 6, 2013
    Falcon offers 2 lengths. 12.9 and 13.15.
    Which have you fitted?
     
  11. MexicoMike

    MexicoMike

    Joined:
    Jan 31, 2010
    I installed the alloy Falcons on my '73 850/stock chain guard last year and they mounted with no issue, replacing the Hagons I had on the bike since '07.
     
  12. Onder

    Onder

    Joined:
    May 11, 2010
    Are you happy with them and is there much of a difference twixt them and the Hagons?
     
  13. Danno

    Danno

    Joined:
    Feb 7, 2010
    Looks like there's a rubber bushing between the shock bottom and the chainguard. Could that have been omitted? I could see a clearance issue if it had been.
     
  14. worntorn

    worntorn

    Joined:
    Dec 22, 2006
    What is the weight of these shocks?

    Glen
     
  15. Fast Eddie

    Fast Eddie VIP MEMBER

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    Oct 4, 2013
  16. Fast Eddie

    Fast Eddie VIP MEMBER

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    Oct 4, 2013
    You sure? I can’t see one.
     
  17. MexicoMike

    MexicoMike

    Joined:
    Jan 31, 2010
    Yes and no to both questions... The spring preload is 'infinitely' adjustable based on the fact that the outer diameter of the shock is threaded for most of its length so there is a huge range of adjustability compared to the Hagons. And, as noted, they are much lighter. I never actually weighed them/the Hagons so I don't know the actual weight difference.

    OTOH, the fact that they are infinitely adjustable makes adjusting them somewhat of a PITA because there are no "clicks" or detents or anything to make it easy to determine where each spring preload is set other than carefully measuring. Not that that's technically difficult but it is more fiddly than dialing in a setting.

    Also, when I received mine - with springs for my specified weight with gear, they didn't work well at all with the preload as delivered. In fact, I nearly lost the bike in a turn and, had there been a car in the opposite lane, we would have crashed. It was great on the road/general riding more comfortable than the Hagons but with the as-delivered pre-load, in 10/10ths cornering (10/10ths of MY ability - probably 5/10ths of most riders) the bike wallowed/pogoed badly and I nearly lost it. This was with the same speeds I would have done the turns with the Hagons with no issues. TO BE FAIR, I should have checked sag after mounting them the first time rather than ASSUMING the correct preload had been 'dialed' in before shipment.

    SO...if you buy them, be sure to check sag, etc BEFORE using them; DON"T assume that because you ordered them for your weight that the spring setting is OK for the way you ride. Actually, they were great as-received for general riding. I always felt like the Hagons were too stiff in general at the lowest setting but they worked great in the twisties. With the new shocks spring preload (sag) now adjusted to work well when aggressively riding in the twisties, they work great in the twisties... and they are pretty much as stiff as the Hagons were. :(

    So, are they worth the money? Well - they look good and they ARE lighter and they work just as well as the Hagons... ;) I would have to say that if you really work at getting the suspension exactly how you want it for specific riding, the fact the they are much more adjustable preload-wise and can be fitted from the factory with whatever spring you want, makes them a better shock.
     
    Last edited: Aug 2, 2019
    elefantrider likes this.
  18. Danno

    Danno

    Joined:
    Feb 7, 2010
    Right there in Dellis' pic. With Girlings, the center bushing contacts the flat washer which lays against the chainguard bracket.
     
  19. Dellis

    Dellis VIP MEMBER

    Joined:
    Jul 22, 2018
    The shocks are mounted directly to the shock mounts on the swinging are there are no spacers.

    Dave
     
  20. Danno

    Danno

    Joined:
    Feb 7, 2010
    Yes, I see now that's the vertical swingarm plate I'm seeing.
     

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