Need to adjust rear suspension
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  1. #1
    Newbie
    My Bike(s)
    Suzuki C90
    Location
    Ashland, MO
    Posts
    14

    Need to adjust rear suspension

    I've got a 07 C90 and it say "5-way adjustable spring preload" but how do I adjust it? I need to soften the bike up a little.

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  3. #2
    M-J Member of the Month!!
    My Bike(s)
    2006 GSXR750
    Location
    Central North Carolina
    Posts
    2,758
    Be carefull how much you soften it up. It can bottom out and make things worse. Even cause an accident if it bottoms and you are hard into a corner. The bike should be set up for sag. I am not sure how much travel a C90 has, but on a sportbike it is usually about 30mm.

    Oh, when you say, "soften it up", what is it doing? The shock not compressing at all?

    Anyway, sorry I could not be of more help. Like I said, I am a sportbiker. Do you have the owner's manual?

  4. #3
    Newbie
    My Bike(s)
    Suzuki C90
    Location
    Ashland, MO
    Posts
    14
    I'm curious as to the 5 adjustments cause to look at the shock it looks non adjustable

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  6. #4
    M-J Member of the Month!!
    My Bike(s)
    2006 GSXR750
    Location
    Central North Carolina
    Posts
    2,758
    I just poked around online and could not find any directions as to how to do it. I could not even find any pictures that would give me an idea. I am sure that someone would be along to help soon.

    Congrats on you bike.

  7. #5
    Newbie
    My Bike(s)
    Suzuki C90
    Location
    Ashland, MO
    Posts
    14
    I found a older post on here and I'm about to go out side and take a look at my rear shock. I'll take a pic of it too.

  8. #6
    Just Won't Go Away !
    My Bike(s)
    several
    Location
    Buford, GA
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    5,197
    Jack the bike up to get the weight off the rear wheel, and take off the right side gas tank cover. You will see two odd looking brass "nuts" on the upper part of the single rear shock. Use a hammer and drift or long screwdriver to knock the top nut loose- it is just a lock nut. Use the bottom nut to make adjustments- turn it clockwise to make the suspension stiffer for better handling, turn it counter-clockwise to make the suspension softer. Tighten the top nut back down to lock the adjuster in place.
    Last edited by DrBob; 03-30-2009 at 07:03 PM.
    You MUST obey the pug dog!


  9. #7
    Newbie
    My Bike(s)
    Suzuki C90
    Location
    Ashland, MO
    Posts
    14
    I'm a big guy about 270lbs and 6'4" and when going down the road it doesn't seem to just hit the bumps it fell like it slams the bumps. So I'm going to try softening a little bit.

    Here is the top and I see what you are talking about.


    Also is ther any way to do this with out jacking up the bike? I don't have a bike jack.

  10. #8
    Puddle Runner
    My Bike(s)
    Boulevard C109RT
    Location
    Calgary Canada
    Posts
    370
    If it's similar to the C109 (shock looks the same), there's a panel on the underside of the bike that removes and you adjust it there.
    I'm sure you can adjust without a jack, just far less comfortable.
    Don

    08 Boulevard C109RT
    Blue - the fastest color
    Calgary Canada

  11. #9
    Super Moderator

    My Bike(s)
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    Ocala, FL
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    12,041
    Quote Originally Posted by armycain View Post
    I'm a big guy about 270lbs and 6'4" and when going down the road it doesn't seem to just hit the bumps it fell like it slams the bumps. So I'm going to try softening a little bit.
    As someone mentioned earlier, considering your size, I think you should measure the "sag" first. What you describe sounds a lot like you are bottomed out to start with. Softening the shocks (or spring pre-load) may not make any noticeable difference.......or make matters worse.

    If you are down against the stop (or very close to it), then you need to adjust the OTHER way.
    Don't believe everything that you think.

  12. #10
    Newbie
    My Bike(s)
    Suzuki C90
    Location
    Ashland, MO
    Posts
    14
    I looked at the brass locking rings and they are compressing the rear spring/ shock all the way and I understand about the bottoming out but I just think the stealership was lazy when I bought it. I wouldn't have gone to the one I did but the owner not the salesman gave me a great deal on it.

  13. #11
    M-J Member of the Month!!
    My Bike(s)
    2006 GSXR750
    Location
    Central North Carolina
    Posts
    2,758
    It does sound like it is bottoming out. By the photo, it looks like it is set to full soft. You probobly need to compress the spring to adjust for your weight.

  14. #12
    Just Won't Go Away !
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    It sounds to me like it is set too soft now. Stiffen it up a full turn or a turn and a half and you should feel a big difference.

    Oh, and it is not anything like the C109- you can only get to it from the top, and you need to take the weight off the rear wheel.
    Last edited by DrBob; 03-31-2009 at 09:55 AM.
    You MUST obey the pug dog!


  15. #13
    Just Won't Go Away !
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    4,989
    Quote Originally Posted by DrBob View Post
    It sounds to me like it is set too soft now. Stiffen it up a full turn or a turn and a half and you should feel a big difference.

  16. #14
    Just Won't Go Away !
    My Bike(s)
    '08 Bandit, '09 Wee Strom
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    St. Cloud, MN 3rd house NW of the Depot
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    4,883
    Yep, I too would say it is too soft and you need a bike jack to do this one. If you want to ask questions from guys that mostly ride the Intruder/C90 then go HERE. Lots more wrenchers there that live eat and breath these bikes.

    BTW, be careful using a screwdriver since it can really cut into the nut. Better off using a brass drift or try and find the actual spanner wrench.
    Last edited by frostbitevinnie; 03-31-2009 at 03:39 PM.

  17. #15
    M-J Member of the Month!!
    My Bike(s)
    2006 GSXR750
    Location
    Central North Carolina
    Posts
    2,758
    Quote Originally Posted by frostbitevinnie View Post
    BTW, be careful using a screwdriver since it can really cut into the nut. Better off using a brass drift or try and find the actual spanner wrench.
    A spanner wrech will make life much easier and cost about $15.00.


 
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