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Thread: Motorcycle suspension help!

  1. #1
    Grand Master oldoakknives's Avatar
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    Motorcycle suspension help!

    Hi just looking for some advice please.

    Went to look at a MV Agusta Brutale 990r, and everything seems good about the bike except the height! There is an adjustable link in the rear which would seem to control the ride height. At the moment it is adjusted as short as possible. First thought is this would be the lowest setting, but I'm not sure it's that simple. Can't find any info online (my Google fu must be waning) and wondered if anyone would know? Shorten or lengthen the link to lower the bike?
    Thanks
    Started out with nothing. Still have most of it left.

  2. #2
    Master Tifa's Avatar
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    If you DO get a height reduction link, then be sure to measure everything up before you start pulling bolts.
    It's very important to lower the front too if you do this.
    Otherwise you'll screw up the geometry (you will to a certain extent anyway...wheelbase for starters)
    Thing to look out for...when you drop the yokes over the forks, will the front wheel on it's upstroke foul the rad?
    Remember in doing this, you'll reduce ground clearance.
    Have you looked at modded seats yet?

  3. #3
    Grand Master Dave+63's Avatar
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    Some bikes/suspension units can be adjusted for length thus increasing/decreasing the rear ride height. Just backing the preload off to minimum can help.

    Whilst raising the rear will quicken the steering (and vice versa), it’s not really noticeable unless you go to extremes.

    As mentioned above though, measure the tide height and lower front and rear by similar amounts but, again as mentioned above, do make sure that the wheel doesn’t foul the radiator.

    You’re unlikely to run out of ground clearance on a Brutale by lowering it an inch or two.

    I used different shocks to get the tide height I wanted on the GPz, it’s 25mm higher at the rear and currently standard at the front. The wheelbase is also 50mm shorter and I’ve not noticed any lack of stability at road speeds.


  4. #4
    Grand Master oldoakknives's Avatar
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    Quote Originally Posted by Tifa View Post
    If you DO get a height reduction link, then be sure to measure everything up before you start pulling bolts.
    It's very important to lower the front too if you do this.
    Otherwise you'll screw up the geometry (you will to a certain extent anyway...wheelbase for starters)
    Thing to look out for...when you drop the yokes over the forks, will the front wheel on it's upstroke foul the rad?
    Remember in doing this, you'll reduce ground clearance.
    Have you looked at modded seats yet?
    Hi, the seat looks wafer thin already on the bike, don't think I'll get much there. I know it may affect the handling but hopefully the 1-1.5 inches I want won't be too bad and can lower the front slightly.

    The link on the rear suspension is arrowed on the picture of a similar bike. At first glance lengthening it would lift the rear but I don't think it's that simple as it locates on a fulcrum type arm on top of the shock.



    Suspension showing fulcrum arm at top where top of shock and adjustable link mount each side.

    Last edited by oldoakknives; 9th August 2019 at 14:30.
    Started out with nothing. Still have most of it left.

  5. #5
    Grand Master oldoakknives's Avatar
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    One of the guys on the MV forum thinks it might be at it's lowest already. If so I'll probably just look for something else, it was just a nice clean example.
    Started out with nothing. Still have most of it left.

  6. #6
    Grand Master Dave+63's Avatar
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    Looking at the diagram, the suspension linkage arm needs to be shorter to lower the rear (effectively pulling the wheel closer). Backing off the preload with the two adjusters on the shock absorber will lower the tide height further.

    Without knowing the settings on the bike you’re looking at, it’s not possible to judge whether it can be lowered further.

  7. #7
    Grand Master oldoakknives's Avatar
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    Thanks, it's probably better to just look for another bike I suppose.
    Started out with nothing. Still have most of it left.

  8. #8
    Grand Master Dave+63's Avatar
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    Well if you like the brutale and can lower it then I’d go for it. You could always get a shorter link rod made up.

    At it’s simplest, it’s just a piece of hex bar with a left hand thread one end and right hand thread the other. A machine shop could knock you one of those up in about fifteen minutes.

  9. #9
    Grand Master oldoakknives's Avatar
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    With all the talk of upsetting handling etc it makes me wonder if it's worth it though. Will have to think about it.
    Thanks.
    Started out with nothing. Still have most of it left.

  10. #10
    Nice bike the Brutale
    Little bit hunched up for me otherwise I’d have one- I tried a nice 1078rr that actually had good bottom end grunt as well as a crazy top end pull
    Try a speed triple r /rs if you like that sort of thing? They ride well too.

  11. #11
    Grand Master Dave+63's Avatar
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    Quote Originally Posted by oldoakknives View Post
    With all the talk of upsetting handling etc it makes me wonder if it's worth it though. Will have to think about it.
    Thanks.
    Don’t worry about the handling; drop the front and rear by the same amount and all you’ll lose is some (of the probably excess for your needs) ground clearance.

  12. #12
    Grand Master Saint-Just's Avatar
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    I can’t help with the original question. But it will make a change from the Dyna!

    Brutal(e)? You bet!
    'Against stupidity, the gods themselves struggle in vain' - Schiller.

  13. #13
    Grand Master oldoakknives's Avatar
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    Quote Originally Posted by Saint-Just View Post
    I can’t help with the original question. But it will make a change from the Dyna!

    Brutal(e)? You bet!
    Looking to lose a bit of weight as the Dyna starts to feel a bit heavy!
    Started out with nothing. Still have most of it left.

  14. #14
    Grand Master Saint-Just's Avatar
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    Half the weight and over thrice the power...
    That will get the the adrenaline flowing
    'Against stupidity, the gods themselves struggle in vain' - Schiller.

  15. #15
    Master Tifa's Avatar
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    Not really a Harley fan, but I'd have thought the HD would have a bit more torque?

  16. #16
    Master
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    Quote Originally Posted by oldoakknives View Post
    With all the talk of upsetting handling etc it makes me wonder if it's worth it though. Will have to think about it.
    Thanks.
    Happy to help


  17. #17
    Grand Master Saint-Just's Avatar
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    'Against stupidity, the gods themselves struggle in vain' - Schiller.

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    Grand Master Chris_in_the_UK's Avatar
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    Quote Originally Posted by oldoakknives View Post
    With all the talk of upsetting handling etc it makes me wonder if it's worth it though. Will have to think about it.
    Thanks.
    Coming from a Harley, a supermarket trolley will be an improvement!
    When you look long into an abyss, the abyss looks long into you.........

  19. #19
    Grand Master oldoakknives's Avatar
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    Quote Originally Posted by Enoch View Post
    Happy to help

    Showing your (our) age there!!
    Started out with nothing. Still have most of it left.

  20. #20
    Grand Master oldoakknives's Avatar
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    Quote Originally Posted by Chris_in_the_UK View Post
    Coming from a Harley, a supermarket trolley will be an improvement!
    Have you ridden many?
    Started out with nothing. Still have most of it left.

  21. #21
    Grand Master Chris_in_the_UK's Avatar
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    Quote Originally Posted by oldoakknives View Post
    Have you ridden many?
    Every week @ Asda.
    When you look long into an abyss, the abyss looks long into you.........

  22. #22
    you can buy a lowering kit for that bike for £60 / 70 , 1970's platforms are prob cheaper thou :P

  23. #23
    Grand Master oldoakknives's Avatar
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    Quote Originally Posted by pugster View Post
    you can buy a lowering kit for that bike for £60 / 70 , 1970's platforms are prob cheaper thou :P
    Where? 2010 990R.
    Started out with nothing. Still have most of it left.

  24. #24
    Grand Master oldoakknives's Avatar
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    Quote Originally Posted by Chris_in_the_UK View Post
    Every week @ Asda.
    Thought so. #armchair expert.
    Started out with nothing. Still have most of it left.

  25. #25
    Grand Master Chris_in_the_UK's Avatar
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    Quote Originally Posted by oldoakknives View Post
    Thought so. #armchair expert.
    Quite the opposite, just having a bit of fun.
    When you look long into an abyss, the abyss looks long into you.........

  26. #26
    Grand Master oldoakknives's Avatar
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    Quote Originally Posted by Chris_in_the_UK View Post
    Quite the opposite, just having a bit of fun.
    Of course.
    Started out with nothing. Still have most of it left.

  27. #27
    Quote Originally Posted by oldoakknives View Post
    Where? 2010 990R.
    my bad - i thought you were looking at a new one from the first post , lust racing do kits from 2013

  28. #28
    Grand Master oldoakknives's Avatar
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    Quote Originally Posted by pugster View Post
    my bad - i thought you were looking at a new one from the first post , lust racing do kits from 2013
    That’s a pity, thought you’d found one I’d missed. ;-)
    Started out with nothing. Still have most of it left.

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