Rear suspension adjustment - 2000 WR400F



13 replies to this topic
  • John_B

Posted March 28, 2002 - 05:26 AM

#1

Can anyone explain to me an easy way to adjust the rear suspension on my WR400? I purchased the 'wrench' but I am having a difficult time figuring out how to get into such a small area to make the adjustment. I weigh 40lbs more than the previous owner so it needs adjusting.

  • Dan_from_HB

Posted March 28, 2002 - 07:10 AM

#2

John,
Sounds like you are referring to the spring preload. I just use a screwdriver, but your wrench is better.
Loosen the top ring (lock ring). Set race sag by sitting on the bike in your normal riding position with most of your gear on (for weight). Have someone measure distance between the rear axle and a fixed point near the rear fender. Write the measurement down. Then put the bike on a stand with wheels off the ground and measure distance between same two points. The difference should be between, say, 3-3/4 inches and 4 inches. If not, loosen sub frame, swing it out of the way and adjust the preload on the spring until you have this difference in the two numbers. (You will have to keep replacing the sub-frame and slipping the top bolt in just to position it).
Take the bike off the stand, bounce it a few times while you are off the bike. Let it settle and take a new measurement between the same two points. The difference between this number and the longest number should be about 3/4 inch or 0.75". This is static sag. If this difference is much smaller (or suspension tops out), you have a spring that is too light. You are having to dial in too much preload in order to support your weight. Get a stiffer spring.
If you adjust this static sag to 3/4", and you then have less than 3-3/4" of race sag (while on the bike), then you have a spring rate that is too stiff (too high). Get a lighter spring.
Many riders adjust to suit riding style, but these are pretty good numbers to start with. You may also want to adjust damping, but write down your current settings before you start(number of clicks from full closed or full open on the adj screws). See manual for location of adjustment points and factory settings. Remember to tighten your lock ring and sub frame bolts.
Dan
PS: these particular models respond dramatically to a little time spent on setup. Your settings may change slightly from one type of terrain to another. For example: one day riding in rocks and tree roots, and one day on high-speed whooped-out trails or roads. Most of the bad press the WR/YZ has received for bad manners in tight, rocky riding has been due to poor suspension setting choices.

  • Tim_in_WA

Posted March 28, 2002 - 08:59 AM

#3

John, I use a long punch and a hammer to loosen the lock rings. The punch reaches in to the lock ring nicely. I then just turn the spring by hand to get whatever setting I need. If it is difficult to turn, spray some silicone on the threads.

  • John_B

Posted March 28, 2002 - 09:39 AM

#4

So I do need to remove the sub frame to adjust? Can you tell me how to do this? Thanks in advance for your help.

John

  • jbird

Posted March 28, 2002 - 10:27 PM

#5

Using a long punch or screw driver to loosen the lock ring you don't need to remove the subframe. Once the lock ring is loose and with the bike on the stand you can grap the sping with your hand and turn it. When the sping turns the other ring will turn with the spring. Like Tim said if the spring is hard to turn just spray lube of some sort on the shock threads.
Jon

[ March 28, 2002: Message edited by: jbird ]

  • John_B

Posted March 28, 2002 - 12:48 PM

#6

Thanks for all your help.

  • slr

Posted March 28, 2002 - 02:03 PM

#7

take mud flap off then you can turn spring easyer. reach in with two hands and turn. i mark the spring to see when i make a full turn.

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  • Dan_from_HB

Posted March 28, 2002 - 03:22 PM

#8

All these work. I don't loosen subframe either, since I use a large screwdriver and a hammer to loosen and adjust the lock rings. Probably a little ham-fisted, but it works. I like the idea of a punch better.
Hope you didn't spend too much on the wrench. Don't be afraid to adjust as long as you write things down.
Dan

  • John_B

Posted March 28, 2002 - 04:12 PM

#9

The wrench was only $12 but sounds like I will not be needing it. The local bike shop quoted me $45-80, talking with all of you is much cheaper! What do you mean by 'write things down'? I obviously have never adjusted my suspension before and figured I would start turning it and check every turn or so. There is about 4-5 inches of 'play' right now so how many turns do you think I need?

  • Dan_from_HB

Posted March 28, 2002 - 06:09 PM

#10

As far as the spring, just mark it on one side and start with about 1/2 turn. If you turn the spring, the bottom lock ring will go with it and thread itself up or down the body, as long as the top ring is real loose.
The writing comes in when you are adjusting the damping, so you don't forget where you were previous to the new adjustments (so you can go back any time). Just keep track of how many "clicks" from full open or full closed. Grab a screwdriver and turn one of the adjusting screws 1/4 to 1/2 turn and then back. Feel the "click"? Just count those and keep track, and you'll be fine. Factory settings are in the manual in case you get it all screwed up. Can't lose. There's even a troubleshooting guide somewhere in the back of the manual that is only of limited assistance, but not too bad. Do it by feel and leave the adjustments where they feel best.
Rocks and roots will likely need less compression and more rebound damping. High speed, g-outs, and whoops will likely need a little more compression and a little less rebound. I usually use a compromise that's not too far from stock for all-around use.
Dan

  • mcarp

Posted March 29, 2002 - 02:49 PM

#11

John-

This is all great advice given.

Just a note. Turning the spring even 1/8 turn produces quite a difference in sag. Small amounts can drastically affect handling.

Use a buddy to hold the bike up while you sit in a neutral position, and another bud to measure sag. Measure it a few different times over the course of a few riding days if possible, and measure with your full riding gear, including camelback.

Good luck and enjoy the bike!

  • John_B

Posted March 30, 2002 - 05:01 AM

#12

I hate to so ignorant but when reading my manual last night it was telling me how to adjust the low and high compression and low and high damping. Why would I do that? My last bike was an XR250L and I never touched the suspension. Now I have the WR400 and there are so many options that it seems overwhelming... I am a good rider buy horrible mechanic. Can anyone explain to me what is the most important adjustment I should make to the suspension? Maybe I am overwhelmed because I have never done it before???? I do appreciate everyone's advice and suggestions. Thanks.

  • Dan_from_HB

Posted March 30, 2002 - 06:49 AM

#13

I was in the same boat. Don't be intimidated. It's only adjustments. The original settings can be restored so easily.
Damping is simply metering a fluid (oil) through an adjustable orifice. The tighter the orifice, the slower the flow rate, the more resistance to movement. Most shocks today have individual adjustment for compression and rebound. The shock on the WR also has adjustment for high speed compression. HS comp adjustment is for the really big hits that happen suddenly. For example, you are doing 70 mph on a road, and you hit a rock or drop into a pothole. HS comp adjustment determines how the shock absorbs those kind of hits. Low speed compression adjustment is for whoops and rolling g-out kind of motion. The travel of the suspension is much less sudden, therefore the HS compression orifice is not a significant factor. The point at which one takes over for the other is a matter of personal preference, and subject to your adjustment. That's why you really have to be riding the bike to tell whether you like the settings. My settings may not be comfortable to you.
Pick a trail with obstacles that are typical to your kind of terrain. Start with factory default settings, adjust one screw at a time. If you want to experiment a little, you can go more than a click or two in one direction. That will likely emphasize the change in performance so it is easier to feel. You can always find a compromise setting that feels more comfortable. That way, you can see what effect each setting has on the handling. They give us these adjustments so we can dial everything in. If your XR had no adjustments, you'll be amazed at how much better this works when you take just a little time to set it up.
BTW, mcarp is right. A careful suspension setup (including spring preload) can make a dramatic difference.
Start with factory defaults. Experiment a little bit each time you go out, write down your settings (and maybe your results), and you'll begin to get a very clear picture of which settings seem to work best for you. Maybe you and I can't ride like Ty Davis, but we can have similar suspension performance.
Dan
PS: "high speed" compression refers to the speed that the suspension goes through its travel, not the ground speed of the bike and rider.

[ March 30, 2002: Message edited by: Dan from HB ]

  • John_B

Posted March 31, 2002 - 04:22 AM

#14

Thanks for everyone's help. I made some adjustments yesterday and now need to get out and ride to test them. I will need to bring along my tools on the next ride so I can modify my suspension. Thanks again.




 
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