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  1. #1

    Default Homework Assignment

    Looking at the weather, it should be a lovely weekend pretty much all over the place. Odds are, many folks will want to get out and ride this weekend.

    For this reason, I'm assigning Homework to each and every member of this fine forum. Homework must be completed before riding this weekend, so grab a beer and head out to the garage.

    This week's homework assignment is: Setting your Sag.

    Setting your suspension's sag is a necessary part of getting the most out of your bike, whether you're on stock suspension, or on upgraded suspension.

    The process is rather easy, but can require 2 people to do properly.

    A member on another forum came up with a suspension "worksheet" for you to record all of your measurements, and this sheet can be downloaded and printed from my Google Docs here: Google Docs

    The process is rather straight forward.
    Step 1: Measure your current setup.

    • Front:
    • Measure from the top of the dust seals on the forks to the triple tree with no weight on the bike.

      Rear:
    • Measure the rear from the ground to a spot on the bike. (This spot must stay the same for all measurements, so take a piece of tape, stick it to the tail and mark it with a Sharpie)


    Step 2: Measure with you sitting on the bike (this is why you need a second person)
    • Measure the movement from the unweighted bike, and compare to measurement with you on the bike
    • Same for the rear


    For the front, you can do it by yourself if you wrap a zip-tie around the fork tube, and with the bike unweighted, push the zip tie down to the top of the dust seal.. then measure from the dust seal to where the zip tie moves to when you sit on the bike.

    Step 3: Adjust.
    You're trying to get the amount of movement to line up with the specified numbers on the chart. In adjusting sag, all you're adjusting is the spring preload. Compression damping and rebound damping are adjusted by feel after you've set the preload.

    Step 4: Measure again

    Step 5: Adjust again.

    Repeat as needed, until you get the movement within specifications.

    ***If you cannot get your sag within specifications, you need new springs.***

    Since I recently reworked my suspension with stiffer springs, and AK-20's I'll be doing this on Thursday. Also my favorite riding buddy got my hand-me-down cartridges with Axxion valving installed so we'll be setting the sag on his 03 FZ as well... So.. I'm not just assigning this for everyone else... I'll be doing it as well.
    Last edited by va_rider; 03-30-2010 at 06:06 AM.
    If it can be modded, it will be modded.

  2. #2

    Default

    Check....ok.. so now what do I do with the rest of the beer???

    But really. This is good advice for every one. Even if you have already done it. Re checking is always good. Things do change. There are a lot of factors going on.

  3. #3
    Moderator Homework Assignment Oldschool's Avatar
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    Default worksheet

    I downloaded and printed that worksheet some time ago. When my riding buddy gets back to town I will get both our machines done and recorded. I have fine tuned my own by "seat of the pants" and a little experimenting and am happy with the feel and performance for now. Having a method and some refference number would be a good thing though. Proper set up means better control and that is always the way to go.

    Thanks
    ____________________________________________
    "We are all just prisoners here, of our own device...We are programed to receive, you can check out any time you like, but you can never leave."



    "Pilots Resume"

  4. #4
    Adminstrator Homework Assignment FZ1inTX's Avatar
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    Default

    Thanks Aaron! I will go do this now as I've yet to properly do it at all.

    Sorry, but I just haveta.... Gian T. Balls Sag!

  5. #5

    Default

    I'd like to see feedback here after you guys have done it as well.... to see how far out some of you were/are before adjusting...

    I'd like to see Sag measurements as it sits now, compared as to what you're new settings are....

    I've set up a few bikes that had 50+mm of sag before I started, then I managed to get them down to 15-20mm...

    *** As another note... if you're a fast rider (don't lie to yourself if you're not) the settings can stand to be a bit tighter... somewhere in the neighborhood of 15mm front and rear.. ***
    If it can be modded, it will be modded.

  6. #6

    Default

    After basic setup is complete... refer here for more advanced setup, and reading your tires:
    [ame=http://www.youtube.com/watch?v=wYkZNaByBog]YouTube - Motorcycle Suspension setup 101.2[/ame]

    [ame=http://www.youtube.com/watch?v=JutNhZw1TB0]YouTube - Types of Tyre Wear on Motorcycles[/ame]
    If it can be modded, it will be modded.

  7. #7

    Default

    Good point VA! i always find myself first trying to get used to the bike before screwing with the suspension. I will change that!

    PS anyone interested the vids in VA's last post are really great. I have a few dvds from this guy and they are great!

  8. #8
    Adminstrator Homework Assignment FZ1inTX's Avatar
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    Default

    Quote Originally Posted by va_rider View Post
    I've set up a few bikes that had 50+mm of sag before I started, then I managed to get them down to 15-20mm...

    *** As another note... if you're a fast rider (don't lie to yourself if you're not) the settings can stand to be a bit tighter... somewhere in the neighborhood of 15mm front and rear.. ***
    What if the rider is "too big boned" and the stock suspension is not enough, sag is still too much and you can't afford major upgrades (because you blew the wad on . . . . oh . . . I don't know.... Maybe a bunch of Copperdog stuff or something like that) ??? Huh??? What then??? :gagged:

  9. #9

    Default

    Then... it's time for new springs... and springs are cheap.... relatively speaking...
    If it can be modded, it will be modded.

  10. #10

    Default

    Quote Originally Posted by FZ1inNH View Post
    Sorry, but I just haveta.... Gian T. Balls Sag!
    well I like to keep my sag at lest 20mm + from the water :dump:

 

 

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