Pre-load adjustments - Kawasaki Teryx Forum
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post #1 of 5 (permalink) Old 06-07-2019, 06:24 AM Thread Starter
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Pre-load adjustments

I noticed on my 18 teryx 4 that the Fox shocks have adjustable preload. Has anyone adjusted these, or are they properly set from the dealer?
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post #2 of 5 (permalink) Old 06-07-2019, 07:32 AM
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I have seen quite a few posts about people adjusting the preload, and I have played around with the adjustment on mine. I decreased the preload on mine attempting to get a softer ride. It helped slightly but nothing major, but it also lost height and ground clearance. Had more issues during my riding style because of getting hung up on rocks and in ruts which outweighed the very slightly softer ride. On the other hand if you increase the preload it will raise the machine up but will cause a slightly harsher ride.

I'm sure somebody will chime in and say changing the preload does not affect the ride, but there is no way it can't. It does not technically change the spring rate but it does change the amount of force required to cause the initial movement of the spring. If you have linear rate springs of 300 lb/in then they are always 300 lb/in rate.........but the difference is in the preload. If you have 1" of preload that means you have 300 lbs. of force already applied to the spring (hence the term "preload") and this means it requires greater than 300 lbs. of force to start moving the springs. Now if you apply 2" of preload on the spring you now have 600 lb. applied to it (simple math....2" x 300 lb = 600), which means now it requires greater than 600 lbs. of force to start moving them. Basically the more preload applied the bigger bump or harsher impact you have to hit before the springs will actually start flexing.
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post #3 of 5 (permalink) Old 06-14-2019, 06:48 AM
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I had problems hanging up on rocks in the rear so I cranked mine down to nearly max factory specs. I didn't notice much difference in the ride quality and it gave me a little more clearance overall.
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post #4 of 5 (permalink) Old 07-19-2019, 10:59 AM
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What i would like to know is what tool do I need to do the preload adjustment.....and a detailed description on how to do it 🙂
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post #5 of 5 (permalink) Old 07-22-2019, 08:29 AM
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Originally Posted by 2Tap View Post
What i would like to know is what tool do I need to do the preload adjustment.....and a detailed description on how to do it 🙂
You need the proper size spanner wrench. If you look right at the top of the springs you will see two thin "nuts" that are threaded on the shock body and are acting as the spring stops. Some people just use a big set of pliers or you can use the punch and hammer method to rotate the nuts. You just tend to booger up the nuts some when you do either of those.

Jack the tires off the ground which takes a lot of pressure off the springs. Loosen the top spanner nut......I've found the best way is to use a punch and hammer to tap it loose and then just spin it up out of the way of the bottom nut. Now you can adjust the bottom spanner nut (that is right against the top of the springs). Make sure the threads on the shock body are fairly clean and spray some lube on them to make it easier. Turning the nut downwards, thus compressing the spring, will increase the preload/tighten the shocks/raise the machine and tends to make the ride a little harsher. Turning the nut upwards, thus releasing the spring some, will decrease the preload/loosen the shocks/lowers the machine. If you decrease the preload you always want to make sure the springs is still tight with the spanner nut. You don't want slop in the spring where there is gap between the spring and nut.

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