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Rear shock length on LM2

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Courier955 View Drop Down
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    Posted: 04 Sep 2019 at 18:24
Hi all...
I was looking at a LM1 manual today which gave the distance between rear shock top and bottom bush centres as 359mm. So out of interest I measured mine on my Mk2. 315mm! 44mm short. I am presuming that the Mk1 and the Mk2 are the same in shock length, or am I wrong?
Mine are Hagons which even on the softest setting give my kidneys a good hammering on bumpy roads (I'm 12 stone roughly) but the bike handles very well and is very stable at speed. I've always had a suspicion that my LM looks slightly low at the back end but it may be my imagination. 44mm seems a lot though. Any thoughts?

    Cheers...Dan
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep 2019 at 20:27
LM1 & LM2 can't be different cos they're the same frame & swingarm etc. So the first number must be wrong!

I had Hagons on mine, and that first number doesn't sound familiar, but I can't remember what the distance actually was.

I had the cheaper, 3-preload only Hagons and yes were a bit "firm", but worked better with some extra weight on the back. Aside from that I thought they were really good.




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Post Options Post Options   Thanks (0) Thanks(0)   Quote Courier955 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2019 at 05:02
Thanks Mike, I think my Hagons must be the same as your old ones, they're good shocks and the bike handles very well. I'm not a 'portly gentleman' so I could do with some slightly more forgiving shocks (maybe an inch or so longer) to soften the ride and bring the rear up slightly.
     
       Cheers...Dan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2019 at 07:49
Beware of fitting overlength suspension units on a Guzzi, you can end up with the shaft U/Js working at too great an angle.
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2019 at 09:00
Also, you'll find that overall shock length has nothing to do with how the rear feels, it's all in the springs and damping.
I've tried several iterations of the IKON 7610 Dial-a-Ride (all 330 mm) on my T3.
They come in different spring lengths, with the studs supporting the cam ring at different heights on the body, and of course different springs.
Best result so far with 7610-1298, 230 mm installed spring length, "red dot" springs.
The bevel reaction and enormous unsprung weight mean it's never going to be perfect or even close.


Edited by jpc - 05 Sep 2019 at 09:09
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Courier955 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2019 at 16:42
I did wonder about that Mike because with me sitting on the bike the swingarm is practically dead straight with the output from the back of the gearbox, coupled with the small movement of the suspension I'm guessing that my UJ has a relatively easy time.

    Cheers...Dan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Courier955 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2019 at 16:42
Sorry, that reply was to Brian not Mike.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Courier955 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2019 at 16:45
Thanks jpc...food for thought. May keep my Hagons then and buy a kidney support belt


    Cheers....Dan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BondEquipe Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2019 at 18:04
If it's any help I've just had a quick look at my bike and the shock length is roughly 325mm (Le Mans 2, Konis, on centre stand, bolt centre to bolt centre).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote c13pep Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2019 at 18:48
Originally posted by Courier955 Courier955 wrote:

Thanks jpc...food for thought. May keep my Hagons then and buy a kidney support belt


    Cheers....Dan


Or maybe sell the kidney and buy Ohlins

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Courier955 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2019 at 19:04
Hi Bond....I measured mine at 315mm on the sidestand so on the centrestand I guess I would be pretty close to your 325mm. Thanks.

   Cheers...Dan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Courier955 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2019 at 19:05
c13p.....I've heard worse ideas


    Cheers...Dan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote drøn Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2019 at 19:57
Your post made me think of this old photo.
What do we think is going on there? Custom swing arm?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Courier955 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2019 at 04:28
Hi dron, looks a bit strange...reducing unsprung weight maybe?


    Cheers...Dan
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Post Options Post Options   Thanks (1) Thanks(1)   Quote drøn Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2019 at 07:39
I was thinking more in relation to overlenght shocks and UJ angle.
Seeing as the rear wheel was stock in the dakar bike, I think the swingarm was too. It's a v50 btw...
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