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DRZ race sag

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This topic contains 9 replies, has 0 voices, and was last updated by  Eric Smith 16 years, 1 month ago.

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  • March 11, 2009 at 6:19 am #96011

    Grant Blacker
    Member

    Just did the race sag adjustment (adjusting tension on rear spring) from manufacturers origonal settings on my DRZ400.
    Firstly I weight 82kg not kitted up. But obviously I was kitted up when making measurements.
    The origonal setting for sag was 115mm. The recommended setting as per TB’s post (setting your suspension sag) is between 100mm and 105mm so my aim was to get 105mm.
    My sag was 10mm too much therefore needed to increase the spring tension by screwing down the rear spring adjusting nut. On the DRZ400 there are 10 little lugs on the adjust nut so if you knock 5 around its 1/2 a turn, 10 around its 1 full turn. Anyway to get a sag of 105mm I needed to turn down the adjust nut 2 1/2 turns. This also resulted in a static sag of 35mm. The origonal static sag before adjusting was 42mm.
    One thing to note TB if your static sag is more than 37.5mm you would need a heavier spring, and if it was less than 12.3mm you would need a lighter spring. Its back to front in your notes.
    Hope this helps anyone with a DRZ400 and of course if your heavier you would need more tension and if your lighter you will need less tension.

    March 11, 2009 at 6:24 am #125457

    Anonymous

    That’s right mate. I was too heavy for my rear spring and wound the preload down 3 turns without making much of a difference (except messing my front end up!). With a heavier spring now fitted I can run less preload (spring wound up the shock, not down) as the increased spring tension maintains a higher rider/race sag :)

    March 11, 2009 at 7:54 am #125460

    Scott Southwell
    Member

    Mate your bang on the weight for the standard rear spring, 82kg.
    Your calculations for race sag are out. I also had this wrong on my DRZ. Most bikes run a sag of 100mm or so. I just had my suspension done by Tekhnik motorsports and was advised the race sag for the DRZ should be around 85mm, with 20-30mm static sag.
    This will make the bike turn much better.

    Mate keep winding that collar, I had to wind mine heaps to get it right but now I got 85mm race sag and 20mm static and I weight 90kg, the spring is only just heavy enough for me but should be fine for you.

    Here’s a link to the Teknik setup guide.
    http://www.teknikracing.com/information;jsessionid=0a010c491f43ec99f7ea859442e68088eac25f9ec8ec.e3eSc3aPaxmLe34Pa38Ta38NaNr0

    March 11, 2009 at 8:32 am #125458

    Grant Blacker
    Member

    Thanks Scotty will make those adjustments but how will that affect the steering wont that put more weight on the front wheel. Have you moved your forks lower in the clamps?

    gotowo

    March 11, 2009 at 8:43 am #125481

    Scott Southwell
    Member

    Yeah it will put more weight on front and give you a steeper steering angle, this should make it turn better. I slid my forks up 5mm yesterday but won’t get to see how it feels till the Denman weekend.

    March 11, 2009 at 11:43 am #125485

    glenn
    Member

    put all my clickers on 7 clicks out and have not had to worry about the static,power,or race sag. cost $$0.00 bike feels awesome. get it wrong and you will chase your tale forever??????????????:unsure: :unsure: :unsure: :unsure: :unsure:sorry 92kilos:S

    March 11, 2009 at 7:53 pm #125497

    Paul
    Member

    I had the 06 DRZ400.
    I think if you’re over 80kg the stock springs are too soft for dirt riding.
    Use the Racetech spring rate calculator here http://www.racetech.com/evalving/menu/searchdirt.asp
    If you do anything more than the clickers & sag adjustments you need to do BOTH front and rear to maintain stability.
    Had mine done at Southlakes Motorcycles and they also lengthened the rear shock by 10mm (easily done).
    The bike was great after that.
    Cost was just over $700. Well worth it.

    March 11, 2009 at 9:44 pm #125504

    Eric Smith
    Member

    Yup, Beemer is spot on. DRZ’s have soft springs, rated for about a 75kg rider. At 92kg you’ll soon find the limits of the suspension, and it won’t be pleasant. That’s not to say the bike will be unrideable, just not as capable as it should be.

    I had my DRZ suspension done by Jay Foreman at Foreman Racing in Newcastle. Cost me $650 including postage and made the suspension the best on any bike I have ridden. Plush enough to soak up decent hits but didn’t bottom on – well anything that I threw at it!

    With a DRZ I would say that spending this kind of money on the suspenders is well worth it.

    March 12, 2009 at 8:37 am #125459

    Grant Blacker
    Member

    Apparently the recommended race sag for the DRZ400 is 85mm+-3mm and static sag is 25mm+-5mm.
    My final No.s after turning the spring adjuster a total of 5 turns down are race sag 92mm and static sag 23mm.This will be my start point after riding at original OEM settings.
    Now I need to make some dampening adjustments

    March 12, 2009 at 12:31 pm #125486

    David
    Member

    Scotty wrote:

    Quote:
    Yeah it will put more weight on front and give you a steeper steering angle, this should make it turn better. I slid my forks up 5mm yesterday but won’t get to see how it feels till the Denman weekend.

    Sliding them up is a way to make them turn better but instability dramas are increased at speeds then, unfortunately you get nothing for nothing, there is always a trade off, but with the right balance in the springs/clickers/sags you will get as good as you can expect with that combo

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